Finding the Fourth Proportional to 99,892.88, 137,858.55 and 57,450.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,892.88 : 137,858.55 = 57,450.50 : x
2. Step 2: Convert to fraction form
   99,892.88/137,858.55 = 57,450.50/x
3. Step 3: Cross multiply
   99,892.88x = 137,858.55 × 57,450.50
4. Step 4: Simplify right side
   99,892.88x = 7,920,042,626.78
5. Step 5: Solve for x
   x = 7,920,042,626.78/99,892.88
6. Step 6: Final answer
   x = 79,285.36