Finding the Fourth Proportional to 100.35, 149.61 and 99.15

Step by Step Solution

1. Step 1: Write the proportion equation
   100.35 : 149.61 = 99.15 : x
2. Step 2: Convert to fraction form
   100.35/149.61 = 99.15/x
3. Step 3: Cross multiply
   100.35x = 149.61 × 99.15
4. Step 4: Simplify right side
   100.35x = 14,833.83
5. Step 5: Solve for x
   x = 14,833.83/100.35
6. Step 6: Final answer
   x = 147.82