Finding the Fourth Proportional to 1,123.10, 1,549.86 and 625.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.10 : 1,549.86 = 625.79 : x
2. Step 2: Convert to fraction form
   1,123.10/1,549.86 = 625.79/x
3. Step 3: Cross multiply
   1,123.10x = 1,549.86 × 625.79
4. Step 4: Simplify right side
   1,123.10x = 969,886.89
5. Step 5: Solve for x
   x = 969,886.89/1,123.10
6. Step 6: Final answer
   x = 863.58