Finding the Fourth Proportional to 71,742.72, 99,003.60 and 39,911.52

Step by Step Solution

1. Step 1: Write the proportion equation
   71,742.72 : 99,003.60 = 39,911.52 : x
2. Step 2: Convert to fraction form
   71,742.72/99,003.60 = 39,911.52/x
3. Step 3: Cross multiply
   71,742.72x = 99,003.60 × 39,911.52
4. Step 4: Simplify right side
   71,742.72x = 3,951,384,161.47
5. Step 5: Solve for x
   x = 3,951,384,161.47/71,742.72
6. Step 6: Final answer
   x = 55,077.14