Finding the Fourth Proportional to 101,008.79, 139,391.56 and 55,686.61

Step by Step Solution

1. Step 1: Write the proportion equation
   101,008.79 : 139,391.56 = 55,686.61 : x
2. Step 2: Convert to fraction form
   101,008.79/139,391.56 = 55,686.61/x
3. Step 3: Cross multiply
   101,008.79x = 139,391.56 × 55,686.61
4. Step 4: Simplify right side
   101,008.79x = 7,762,243,439.01
5. Step 5: Solve for x
   x = 7,762,243,439.01/101,008.79
6. Step 6: Final answer
   x = 76,847.21