Finding the Fourth Proportional to 1,123.15, 1,550.01 and 625.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.15 : 1,550.01 = 625.78 : x
2. Step 2: Convert to fraction form
   1,123.15/1,550.01 = 625.78/x
3. Step 3: Cross multiply
   1,123.15x = 1,550.01 × 625.78
4. Step 4: Simplify right side
   1,123.15x = 969,965.26
5. Step 5: Solve for x
   x = 969,965.26/1,123.15
6. Step 6: Final answer
   x = 863.61