Finding the Fourth Proportional to 104.00, 155.31 and 90.18

Step by Step Solution

1. Step 1: Write the proportion equation
   104.00 : 155.31 = 90.18 : x
2. Step 2: Convert to fraction form
   104.00/155.31 = 90.18/x
3. Step 3: Cross multiply
   104.00x = 155.31 × 90.18
4. Step 4: Simplify right side
   104.00x = 14,005.86
5. Step 5: Solve for x
   x = 14,005.86/104.00
6. Step 6: Final answer
   x = 134.68