Finding the Fourth Proportional to 72,139.32, 99,550.40 and 40,308.48

Step by Step Solution

1. Step 1: Write the proportion equation
   72,139.32 : 99,550.40 = 40,308.48 : x
2. Step 2: Convert to fraction form
   72,139.32/99,550.40 = 40,308.48/x
3. Step 3: Cross multiply
   72,139.32x = 99,550.40 × 40,308.48
4. Step 4: Simplify right side
   72,139.32x = 4,012,725,105.85
5. Step 5: Solve for x
   x = 4,012,725,105.85/72,139.32
6. Step 6: Final answer
   x = 55,624.66