Finding the Fourth Proportional to 98.72, 136.25 and 59.91

Step by Step Solution

1. Step 1: Write the proportion equation
   98.72 : 136.25 = 59.91 : x
2. Step 2: Convert to fraction form
   98.72/136.25 = 59.91/x
3. Step 3: Cross multiply
   98.72x = 136.25 × 59.91
4. Step 4: Simplify right side
   98.72x = 8,162.15
5. Step 5: Solve for x
   x = 8,162.15/98.72
6. Step 6: Final answer
   x = 82.68