Finding the Fourth Proportional to 17,878.82, 24,672.77 and 9,921.10

Step by Step Solution

1. Step 1: Write the proportion equation
   17,878.82 : 24,672.77 = 9,921.10 : x
2. Step 2: Convert to fraction form
   17,878.82/24,672.77 = 9,921.10/x
3. Step 3: Cross multiply
   17,878.82x = 24,672.77 × 9,921.10
4. Step 4: Simplify right side
   17,878.82x = 244,781,018.45
5. Step 5: Solve for x
   x = 244,781,018.45/17,878.82
6. Step 6: Final answer
   x = 13,691.12