Finding the Fourth Proportional to 64,013.25, 88,379.89 and 57,287.31

Step by Step Solution

1. Step 1: Write the proportion equation
   64,013.25 : 88,379.89 = 57,287.31 : x
2. Step 2: Convert to fraction form
   64,013.25/88,379.89 = 57,287.31/x
3. Step 3: Cross multiply
   64,013.25x = 88,379.89 × 57,287.31
4. Step 4: Simplify right side
   64,013.25x = 5,063,046,156.20
5. Step 5: Solve for x
   x = 5,063,046,156.20/64,013.25
6. Step 6: Final answer
   x = 79,093.72