Finding the Fourth Proportional to 99,428.43, 137,180.32 and 56,400.82

Step by Step Solution

1. Step 1: Write the proportion equation
   99,428.43 : 137,180.32 = 56,400.82 : x
2. Step 2: Convert to fraction form
   99,428.43/137,180.32 = 56,400.82/x
3. Step 3: Cross multiply
   99,428.43x = 137,180.32 × 56,400.82
4. Step 4: Simplify right side
   99,428.43x = 7,737,082,535.86
5. Step 5: Solve for x
   x = 7,737,082,535.86/99,428.43
6. Step 6: Final answer
   x = 77,815.60