Finding the Fourth Proportional to 99.42, 148.82 and 72.24

Step by Step Solution

1. Step 1: Write the proportion equation
   99.42 : 148.82 = 72.24 : x
2. Step 2: Convert to fraction form
   99.42/148.82 = 72.24/x
3. Step 3: Cross multiply
   99.42x = 148.82 × 72.24
4. Step 4: Simplify right side
   99.42x = 10,750.40
5. Step 5: Solve for x
   x = 10,750.40/99.42
6. Step 6: Final answer
   x = 108.13