Finding the Fourth Proportional to 99.91, 150.55 and 82.27

Step by Step Solution

1. Step 1: Write the proportion equation
   99.91 : 150.55 = 82.27 : x
2. Step 2: Convert to fraction form
   99.91/150.55 = 82.27/x
3. Step 3: Cross multiply
   99.91x = 150.55 × 82.27
4. Step 4: Simplify right side
   99.91x = 12,385.75
5. Step 5: Solve for x
   x = 12,385.75/99.91
6. Step 6: Final answer
   x = 123.97