Finding the Fourth Proportional to 123.48, 185.32 and 90.56

Step by Step Solution

1. Step 1: Write the proportion equation
   123.48 : 185.32 = 90.56 : x
2. Step 2: Convert to fraction form
   123.48/185.32 = 90.56/x
3. Step 3: Cross multiply
   123.48x = 185.32 × 90.56
4. Step 4: Simplify right side
   123.48x = 16,782.58
5. Step 5: Solve for x
   x = 16,782.58/123.48
6. Step 6: Final answer
   x = 135.91