Finding the Fourth Proportional to 99.18, 136.82 and 91.41

Step by Step Solution

1. Step 1: Write the proportion equation
   99.18 : 136.82 = 91.41 : x
2. Step 2: Convert to fraction form
   99.18/136.82 = 91.41/x
3. Step 3: Cross multiply
   99.18x = 136.82 × 91.41
4. Step 4: Simplify right side
   99.18x = 12,506.72
5. Step 5: Solve for x
   x = 12,506.72/99.18
6. Step 6: Final answer
   x = 126.10