Finding the Fourth Proportional to 71,719.49, 98,976.40 and 39,887.71

Step by Step Solution

1. Step 1: Write the proportion equation
   71,719.49 : 98,976.40 = 39,887.71 : x
2. Step 2: Convert to fraction form
   71,719.49/98,976.40 = 39,887.71/x
3. Step 3: Cross multiply
   71,719.49x = 98,976.40 × 39,887.71
4. Step 4: Simplify right side
   71,719.49x = 3,947,941,445.16
5. Step 5: Solve for x
   x = 3,947,941,445.16/71,719.49
6. Step 6: Final answer
   x = 55,046.98