Finding the Fourth Proportional to 71,789.64, 99,067.50 and 39,957.72

Step by Step Solution

1. Step 1: Write the proportion equation
   71,789.64 : 99,067.50 = 39,957.72 : x
2. Step 2: Convert to fraction form
   71,789.64/99,067.50 = 39,957.72/x
3. Step 3: Cross multiply
   71,789.64x = 99,067.50 × 39,957.72
4. Step 4: Simplify right side
   71,789.64x = 3,958,511,426.10
5. Step 5: Solve for x
   x = 3,958,511,426.10/71,789.64
6. Step 6: Final answer
   x = 55,140.43