Finding the Fourth Proportional to 1,123.16, 1,549.88 and 625.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.16 : 1,549.88 = 625.70 : x
2. Step 2: Convert to fraction form
   1,123.16/1,549.88 = 625.70/x
3. Step 3: Cross multiply
   1,123.16x = 1,549.88 × 625.70
4. Step 4: Simplify right side
   1,123.16x = 969,759.92
5. Step 5: Solve for x
   x = 969,759.92/1,123.16
6. Step 6: Final answer
   x = 863.42