Finding the Fourth Proportional to 99.62, 149.42 and 53.96

Step by Step Solution

1. Step 1: Write the proportion equation
   99.62 : 149.42 = 53.96 : x
2. Step 2: Convert to fraction form
   99.62/149.42 = 53.96/x
3. Step 3: Cross multiply
   99.62x = 149.42 × 53.96
4. Step 4: Simplify right side
   99.62x = 8,061.69
5. Step 5: Solve for x
   x = 8,061.69/99.62
6. Step 6: Final answer
   x = 80.93