Finding the Fourth Proportional to 99.67, 149.50 and 82.52

Step by Step Solution

1. Step 1: Write the proportion equation
   99.67 : 149.50 = 82.52 : x
2. Step 2: Convert to fraction form
   99.67/149.50 = 82.52/x
3. Step 3: Cross multiply
   99.67x = 149.50 × 82.52
4. Step 4: Simplify right side
   99.67x = 12,336.74
5. Step 5: Solve for x
   x = 12,336.74/99.67
6. Step 6: Final answer
   x = 123.78