Finding the Fourth Proportional to 71,510.81, 98,684.60 and 39,679.63

Step by Step Solution

1. Step 1: Write the proportion equation
   71,510.81 : 98,684.60 = 39,679.63 : x
2. Step 2: Convert to fraction form
   71,510.81/98,684.60 = 39,679.63/x
3. Step 3: Cross multiply
   71,510.81x = 98,684.60 × 39,679.63
4. Step 4: Simplify right side
   71,510.81x = 3,915,767,969.59
5. Step 5: Solve for x
   x = 3,915,767,969.59/71,510.81
6. Step 6: Final answer
   x = 54,757.71