Finding the Fourth Proportional to 99.83, 149.61 and 80.62

Step by Step Solution

1. Step 1: Write the proportion equation
   99.83 : 149.61 = 80.62 : x
2. Step 2: Convert to fraction form
   99.83/149.61 = 80.62/x
3. Step 3: Cross multiply
   99.83x = 149.61 × 80.62
4. Step 4: Simplify right side
   99.83x = 12,061.56
5. Step 5: Solve for x
   x = 12,061.56/99.83
6. Step 6: Final answer
   x = 120.82