Finding the Fourth Proportional to 100,761.05, 139,050.24 and 55,438.04

Step by Step Solution

1. Step 1: Write the proportion equation
   100,761.05 : 139,050.24 = 55,438.04 : x
2. Step 2: Convert to fraction form
   100,761.05/139,050.24 = 55,438.04/x
3. Step 3: Cross multiply
   100,761.05x = 139,050.24 × 55,438.04
4. Step 4: Simplify right side
   100,761.05x = 7,708,672,906.86
5. Step 5: Solve for x
   x = 7,708,672,906.86/100,761.05
6. Step 6: Final answer
   x = 76,504.49