Finding the Fourth Proportional to 101,380.32, 139,902.35 and 56,057.15

Step by Step Solution

1. Step 1: Write the proportion equation
   101,380.32 : 139,902.35 = 56,057.15 : x
2. Step 2: Convert to fraction form
   101,380.32/139,902.35 = 56,057.15/x
3. Step 3: Cross multiply
   101,380.32x = 139,902.35 × 56,057.15
4. Step 4: Simplify right side
   101,380.32x = 7,842,527,088.77
5. Step 5: Solve for x
   x = 7,842,527,088.77/101,380.32
6. Step 6: Final answer
   x = 77,357.49