Finding the Fourth Proportional to 99.62, 149.52 and 72.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99.62 : 149.52 = 72.50 : x
2. Step 2: Convert to fraction form
   99.62/149.52 = 72.50/x
3. Step 3: Cross multiply
   99.62x = 149.52 × 72.50
4. Step 4: Simplify right side
   99.62x = 10,840.20
5. Step 5: Solve for x
   x = 10,840.20/99.62
6. Step 6: Final answer
   x = 108.82