Finding the Fourth Proportional to 72,308.12, 99,785.59 and 40,043.79

Step by Step Solution

1. Step 1: Write the proportion equation
   72,308.12 : 99,785.59 = 40,043.79 : x
2. Step 2: Convert to fraction form
   72,308.12/99,785.59 = 40,043.79/x
3. Step 3: Cross multiply
   72,308.12x = 99,785.59 × 40,043.79
4. Step 4: Simplify right side
   72,308.12x = 3,995,793,110.88
5. Step 5: Solve for x
   x = 3,995,793,110.88/72,308.12
6. Step 6: Final answer
   x = 55,260.65