Finding the Fourth Proportional to 85,945.56, 128,896.02 and 57,849.72

Step by Step Solution

1. Step 1: Write the proportion equation
   85,945.56 : 128,896.02 = 57,849.72 : x
2. Step 2: Convert to fraction form
   85,945.56/128,896.02 = 57,849.72/x
3. Step 3: Cross multiply
   85,945.56x = 128,896.02 × 57,849.72
4. Step 4: Simplify right side
   85,945.56x = 7,456,598,666.11
5. Step 5: Solve for x
   x = 7,456,598,666.11/85,945.56
6. Step 6: Final answer
   x = 86,759.56