Finding the Fourth Proportional to 99.06, 136.71 and 90.82

Step by Step Solution

1. Step 1: Write the proportion equation
   99.06 : 136.71 = 90.82 : x
2. Step 2: Convert to fraction form
   99.06/136.71 = 90.82/x
3. Step 3: Cross multiply
   99.06x = 136.71 × 90.82
4. Step 4: Simplify right side
   99.06x = 12,416.00
5. Step 5: Solve for x
   x = 12,416.00/99.06
6. Step 6: Final answer
   x = 125.34