Finding the Fourth Proportional to 100.98, 139.50 and 99.16

Step by Step Solution

1. Step 1: Write the proportion equation
   100.98 : 139.50 = 99.16 : x
2. Step 2: Convert to fraction form
   100.98/139.50 = 99.16/x
3. Step 3: Cross multiply
   100.98x = 139.50 × 99.16
4. Step 4: Simplify right side
   100.98x = 13,832.47
5. Step 5: Solve for x
   x = 13,832.47/100.98
6. Step 6: Final answer
   x = 136.98