Finding the Fourth Proportional to 1,085.34, 1,626.12 and 903.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.34 : 1,626.12 = 903.90 : x
2. Step 2: Convert to fraction form
   1,085.34/1,626.12 = 903.90/x
3. Step 3: Cross multiply
   1,085.34x = 1,626.12 × 903.90
4. Step 4: Simplify right side
   1,085.34x = 1,469,849.87
5. Step 5: Solve for x
   x = 1,469,849.87/1,085.34
6. Step 6: Final answer
   x = 1,354.28