Finding the Fourth Proportional to 91,715.48, 126,513.56 and 57,670

Step by Step Solution

1. Step 1: Write the proportion equation
   91,715.48 : 126,513.56 = 57,670 : x
2. Step 2: Convert to fraction form
   91,715.48/126,513.56 = 57,670/x
3. Step 3: Cross multiply
   91,715.48x = 126,513.56 × 57,670
4. Step 4: Simplify right side
   91,715.48x = 7,296,037,005.20
5. Step 5: Solve for x
   x = 7,296,037,005.20/91,715.48
6. Step 6: Final answer
   x = 79,550.77