Finding the Fourth Proportional to 99.42, 149.17 and 72.59

Step by Step Solution

1. Step 1: Write the proportion equation
   99.42 : 149.17 = 72.59 : x
2. Step 2: Convert to fraction form
   99.42/149.17 = 72.59/x
3. Step 3: Cross multiply
   99.42x = 149.17 × 72.59
4. Step 4: Simplify right side
   99.42x = 10,827.50
5. Step 5: Solve for x
   x = 10,827.50/99.42
6. Step 6: Final answer
   x = 108.91