Finding the Fourth Proportional to 99,414.88, 137,196.32 and 56,981.60

Step by Step Solution

1. Step 1: Write the proportion equation
   99,414.88 : 137,196.32 = 56,981.60 : x
2. Step 2: Convert to fraction form
   99,414.88/137,196.32 = 56,981.60/x
3. Step 3: Cross multiply
   99,414.88x = 137,196.32 × 56,981.60
4. Step 4: Simplify right side
   99,414.88x = 7,817,665,827.71
5. Step 5: Solve for x
   x = 7,817,665,827.71/99,414.88
6. Step 6: Final answer
   x = 78,636.78