Finding the Fourth Proportional to 76,128.50, 105,057.34 and 42,600.98

Step by Step Solution

1. Step 1: Write the proportion equation
   76,128.50 : 105,057.34 = 42,600.98 : x
2. Step 2: Convert to fraction form
   76,128.50/105,057.34 = 42,600.98/x
3. Step 3: Cross multiply
   76,128.50x = 105,057.34 × 42,600.98
4. Step 4: Simplify right side
   76,128.50x = 4,475,545,640.19
5. Step 5: Solve for x
   x = 4,475,545,640.19/76,128.50
6. Step 6: Final answer
   x = 58,789.36