Finding the Fourth Proportional to 99,428.94, 137,181 and 56,401.32

Step by Step Solution

1. Step 1: Write the proportion equation
   99,428.94 : 137,181 = 56,401.32 : x
2. Step 2: Convert to fraction form
   99,428.94/137,181 = 56,401.32/x
3. Step 3: Cross multiply
   99,428.94x = 137,181 × 56,401.32
4. Step 4: Simplify right side
   99,428.94x = 7,737,189,478.92
5. Step 5: Solve for x
   x = 7,737,189,478.92/99,428.94
6. Step 6: Final answer
   x = 77,816.27