Finding the Fourth Proportional to 102,765.38, 141,815.75 and 57,443.31

Step by Step Solution

1. Step 1: Write the proportion equation
   102,765.38 : 141,815.75 = 57,443.31 : x
2. Step 2: Convert to fraction form
   102,765.38/141,815.75 = 57,443.31/x
3. Step 3: Cross multiply
   102,765.38x = 141,815.75 × 57,443.31
4. Step 4: Simplify right side
   102,765.38x = 8,146,365,802.92
5. Step 5: Solve for x
   x = 8,146,365,802.92/102,765.38
6. Step 6: Final answer
   x = 79,271.50