Finding the Fourth Proportional to 71,772.72, 99,044.28 and 39,942.72

Step by Step Solution

1. Step 1: Write the proportion equation
   71,772.72 : 99,044.28 = 39,942.72 : x
2. Step 2: Convert to fraction form
   71,772.72/99,044.28 = 39,942.72/x
3. Step 3: Cross multiply
   71,772.72x = 99,044.28 × 39,942.72
4. Step 4: Simplify right side
   71,772.72x = 3,956,097,943.64
5. Step 5: Solve for x
   x = 3,956,097,943.64/71,772.72
6. Step 6: Final answer
   x = 55,119.80