Finding the Fourth Proportional to 1,018.56, 1,405.72 and 625.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.56 : 1,405.72 = 625.51 : x
2. Step 2: Convert to fraction form
   1,018.56/1,405.72 = 625.51/x
3. Step 3: Cross multiply
   1,018.56x = 1,405.72 × 625.51
4. Step 4: Simplify right side
   1,018.56x = 879,291.92
5. Step 5: Solve for x
   x = 879,291.92/1,018.56
6. Step 6: Final answer
   x = 863.27