Finding the Fourth Proportional to 102,018.02, 140,775.90 and 56,693.15

Step by Step Solution

1. Step 1: Write the proportion equation
   102,018.02 : 140,775.90 = 56,693.15 : x
2. Step 2: Convert to fraction form
   102,018.02/140,775.90 = 56,693.15/x
3. Step 3: Cross multiply
   102,018.02x = 140,775.90 × 56,693.15
4. Step 4: Simplify right side
   102,018.02x = 7,981,029,215.09
5. Step 5: Solve for x
   x = 7,981,029,215.09/102,018.02
6. Step 6: Final answer
   x = 78,231.56