Final answer:
The word form of the number 15,478 is 'fifteen thousand, four hundred seventy-eight'.
Step-by-step explanation:
The word form of the number 15,478 is fifteen thousand, four hundred seventy-eight. In this form, the number is broken down into its place values and read from left to right. The number 15 represents the thousands place, 4 represents the hundreds place, 7 represents the tens place, and 8 represents the ones place.
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