Finding the Fourth Proportional to 105.24, 156.94 and 99.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105.24 : 156.94 = 99.12 : x
2. Step 2: Convert to fraction form
   105.24/156.94 = 99.12/x
3. Step 3: Cross multiply
   105.24x = 156.94 × 99.12
4. Step 4: Simplify right side
   105.24x = 15,555.89
5. Step 5: Solve for x
   x = 15,555.89/105.24
6. Step 6: Final answer
   x = 147.81