Finding the Fourth Proportional to 72,139.07, 99,550.05 and 40,308.23

Step by Step Solution

1. Step 1: Write the proportion equation
   72,139.07 : 99,550.05 = 40,308.23 : x
2. Step 2: Convert to fraction form
   72,139.07/99,550.05 = 40,308.23/x
3. Step 3: Cross multiply
   72,139.07x = 99,550.05 × 40,308.23
4. Step 4: Simplify right side
   72,139.07x = 4,012,686,311.91
5. Step 5: Solve for x
   x = 4,012,686,311.91/72,139.07
6. Step 6: Final answer
   x = 55,624.31