Finding the Fourth Proportional to 99,487.63, 137,298 and 56,470.15

Step by Step Solution

1. Step 1: Write the proportion equation
   99,487.63 : 137,298 = 56,470.15 : x
2. Step 2: Convert to fraction form
   99,487.63/137,298 = 56,470.15/x
3. Step 3: Cross multiply
   99,487.63x = 137,298 × 56,470.15
4. Step 4: Simplify right side
   99,487.63x = 7,753,238,654.70
5. Step 5: Solve for x
   x = 7,753,238,654.70/99,487.63
6. Step 6: Final answer
   x = 77,931.69