Finding the Fourth Proportional to 1,522.10, 2,281.80 and 905.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,522.10 : 2,281.80 = 905.15 : x
2. Step 2: Convert to fraction form
   1,522.10/2,281.80 = 905.15/x
3. Step 3: Cross multiply
   1,522.10x = 2,281.80 × 905.15
4. Step 4: Simplify right side
   1,522.10x = 2,065,371.27
5. Step 5: Solve for x
   x = 2,065,371.27/1,522.10
6. Step 6: Final answer
   x = 1,356.92