Finding the Fourth Proportional to 99.37, 137.37 and 90.37

Step by Step Solution

1. Step 1: Write the proportion equation
   99.37 : 137.37 = 90.37 : x
2. Step 2: Convert to fraction form
   99.37/137.37 = 90.37/x
3. Step 3: Cross multiply
   99.37x = 137.37 × 90.37
4. Step 4: Simplify right side
   99.37x = 12,414.13
5. Step 5: Solve for x
   x = 12,414.13/99.37
6. Step 6: Final answer
   x = 124.93