Finding the Fourth Proportional to 102,162.72, 140,983.20 and 57,450.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,162.72 : 140,983.20 = 57,450.72 : x
2. Step 2: Convert to fraction form
   102,162.72/140,983.20 = 57,450.72/x
3. Step 3: Cross multiply
   102,162.72x = 140,983.20 × 57,450.72
4. Step 4: Simplify right side
   102,162.72x = 8,099,586,347.90
5. Step 5: Solve for x
   x = 8,099,586,347.90/102,162.72
6. Step 6: Final answer
   x = 79,281.23