Finding the Fourth Proportional to 71,706.36, 98,947.20 and 39,870.12

Step by Step Solution

1. Step 1: Write the proportion equation
   71,706.36 : 98,947.20 = 39,870.12 : x
2. Step 2: Convert to fraction form
   71,706.36/98,947.20 = 39,870.12/x
3. Step 3: Cross multiply
   71,706.36x = 98,947.20 × 39,870.12
4. Step 4: Simplify right side
   71,706.36x = 3,945,036,737.66
5. Step 5: Solve for x
   x = 3,945,036,737.66/71,706.36
6. Step 6: Final answer
   x = 55,016.55