Finding the Fourth Proportional to 123.18, 184.00 and 90.39

Step by Step Solution

1. Step 1: Write the proportion equation
   123.18 : 184.00 = 90.39 : x
2. Step 2: Convert to fraction form
   123.18/184.00 = 90.39/x
3. Step 3: Cross multiply
   123.18x = 184.00 × 90.39
4. Step 4: Simplify right side
   123.18x = 16,631.31
5. Step 5: Solve for x
   x = 16,631.31/123.18
6. Step 6: Final answer
   x = 135.02