Finding the Fourth Proportional to 99.18, 147.98 and 89.42

Step by Step Solution

1. Step 1: Write the proportion equation
   99.18 : 147.98 = 89.42 : x
2. Step 2: Convert to fraction form
   99.18/147.98 = 89.42/x
3. Step 3: Cross multiply
   99.18x = 147.98 × 89.42
4. Step 4: Simplify right side
   99.18x = 13,231.86
5. Step 5: Solve for x
   x = 13,231.86/99.18
6. Step 6: Final answer
   x = 133.41