Finding the Fourth Proportional to 123.32, 184.58 and 90.72

Step by Step Solution

1. Step 1: Write the proportion equation
   123.32 : 184.58 = 90.72 : x
2. Step 2: Convert to fraction form
   123.32/184.58 = 90.72/x
3. Step 3: Cross multiply
   123.32x = 184.58 × 90.72
4. Step 4: Simplify right side
   123.32x = 16,745.10
5. Step 5: Solve for x
   x = 16,745.10/123.32
6. Step 6: Final answer
   x = 135.79