Finding the Fourth Proportional to 60,128.80, 90,411.90 and 58,816.60

Step by Step Solution

1. Step 1: Write the proportion equation
   60,128.80 : 90,411.90 = 58,816.60 : x
2. Step 2: Convert to fraction form
   60,128.80/90,411.90 = 58,816.60/x
3. Step 3: Cross multiply
   60,128.80x = 90,411.90 × 58,816.60
4. Step 4: Simplify right side
   60,128.80x = 5,317,720,557.54
5. Step 5: Solve for x
   x = 5,317,720,557.54/60,128.80
6. Step 6: Final answer
   x = 88,438.83