Finding the Fourth Proportional to 93,123.48, 128,435 and 57,249.38

Step by Step Solution

1. Step 1: Write the proportion equation
   93,123.48 : 128,435 = 57,249.38 : x
2. Step 2: Convert to fraction form
   93,123.48/128,435 = 57,249.38/x
3. Step 3: Cross multiply
   93,123.48x = 128,435 × 57,249.38
4. Step 4: Simplify right side
   93,123.48x = 7,352,824,120.30
5. Step 5: Solve for x
   x = 7,352,824,120.30/93,123.48
6. Step 6: Final answer
   x = 78,957.79