Finding the Fourth Proportional to 79,872.71, 110,290.67 and 71,359.80

Step by Step Solution

1. Step 1: Write the proportion equation
   79,872.71 : 110,290.67 = 71,359.80 : x
2. Step 2: Convert to fraction form
   79,872.71/110,290.67 = 71,359.80/x
3. Step 3: Cross multiply
   79,872.71x = 110,290.67 × 71,359.80
4. Step 4: Simplify right side
   79,872.71x = 7,870,319,796.27
5. Step 5: Solve for x
   x = 7,870,319,796.27/79,872.71
6. Step 6: Final answer
   x = 98,535.79