Finding the Fourth Proportional to 98.72, 147.98 and 71.30

Step by Step Solution

1. Step 1: Write the proportion equation
   98.72 : 147.98 = 71.30 : x
2. Step 2: Convert to fraction form
   98.72/147.98 = 71.30/x
3. Step 3: Cross multiply
   98.72x = 147.98 × 71.30
4. Step 4: Simplify right side
   98.72x = 10,550.97
5. Step 5: Solve for x
   x = 10,550.97/98.72
6. Step 6: Final answer
   x = 106.88