Finding the Fourth Proportional to 105.59, 158.10 and 99.53

Step by Step Solution

1. Step 1: Write the proportion equation
   105.59 : 158.10 = 99.53 : x
2. Step 2: Convert to fraction form
   105.59/158.10 = 99.53/x
3. Step 3: Cross multiply
   105.59x = 158.10 × 99.53
4. Step 4: Simplify right side
   105.59x = 15,734.90
5. Step 5: Solve for x
   x = 15,734.90/105.59
6. Step 6: Final answer
   x = 149.02