Finding the Fourth Proportional to 17,878.98, 24,672.78 and 9,921.12

Step by Step Solution

1. Step 1: Write the proportion equation
   17,878.98 : 24,672.78 = 9,921.12 : x
2. Step 2: Convert to fraction form
   17,878.98/24,672.78 = 9,921.12/x
3. Step 3: Cross multiply
   17,878.98x = 24,672.78 × 9,921.12
4. Step 4: Simplify right side
   17,878.98x = 244,781,611.11
5. Step 5: Solve for x
   x = 244,781,611.11/17,878.98
6. Step 6: Final answer
   x = 13,691.03