Finding the Fourth Proportional to 64,116.62, 88,505.63 and 57,390.38

Step by Step Solution

1. Step 1: Write the proportion equation
   64,116.62 : 88,505.63 = 57,390.38 : x
2. Step 2: Convert to fraction form
   64,116.62/88,505.63 = 57,390.38/x
3. Step 3: Cross multiply
   64,116.62x = 88,505.63 × 57,390.38
4. Step 4: Simplify right side
   64,116.62x = 5,079,371,450.89
5. Step 5: Solve for x
   x = 5,079,371,450.89/64,116.62
6. Step 6: Final answer
   x = 79,220.82