Finding the Fourth Proportional to 1,018.28, 1,404.51 and 625.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.28 : 1,404.51 = 625.52 : x
2. Step 2: Convert to fraction form
   1,018.28/1,404.51 = 625.52/x
3. Step 3: Cross multiply
   1,018.28x = 1,404.51 × 625.52
4. Step 4: Simplify right side
   1,018.28x = 878,549.10
5. Step 5: Solve for x
   x = 878,549.10/1,018.28
6. Step 6: Final answer
   x = 862.78