Finding the Fourth Proportional to 100.98, 139.25 and 86.27

Step by Step Solution

1. Step 1: Write the proportion equation
   100.98 : 139.25 = 86.27 : x
2. Step 2: Convert to fraction form
   100.98/139.25 = 86.27/x
3. Step 3: Cross multiply
   100.98x = 139.25 × 86.27
4. Step 4: Simplify right side
   100.98x = 12,012.62
5. Step 5: Solve for x
   x = 12,012.62/100.98
6. Step 6: Final answer
   x = 118.96