Finding the Fourth Proportional to 1,626.24, 2,436.57 and 1,281.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,626.24 : 2,436.57 = 1,281.78 : x
2. Step 2: Convert to fraction form
   1,626.24/2,436.57 = 1,281.78/x
3. Step 3: Cross multiply
   1,626.24x = 2,436.57 × 1,281.78
4. Step 4: Simplify right side
   1,626.24x = 3,123,146.69
5. Step 5: Solve for x
   x = 3,123,146.69/1,626.24
6. Step 6: Final answer
   x = 1,920.47