Finding the Fourth Proportional to 99,391.38, 137,160.05 and 56,974.52

Step by Step Solution

1. Step 1: Write the proportion equation
   99,391.38 : 137,160.05 = 56,974.52 : x
2. Step 2: Convert to fraction form
   99,391.38/137,160.05 = 56,974.52/x
3. Step 3: Cross multiply
   99,391.38x = 137,160.05 × 56,974.52
4. Step 4: Simplify right side
   99,391.38x = 7,814,627,041.25
5. Step 5: Solve for x
   x = 7,814,627,041.25/99,391.38
6. Step 6: Final answer
   x = 78,624.80