Finding the Fourth Proportional to 99.82, 137.67 and 90.22

Step by Step Solution

1. Step 1: Write the proportion equation
   99.82 : 137.67 = 90.22 : x
2. Step 2: Convert to fraction form
   99.82/137.67 = 90.22/x
3. Step 3: Cross multiply
   99.82x = 137.67 × 90.22
4. Step 4: Simplify right side
   99.82x = 12,420.59
5. Step 5: Solve for x
   x = 12,420.59/99.82
6. Step 6: Final answer
   x = 124.43