Finding the Fourth Proportional to 1,018.42, 1,405.02 and 625.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.42 : 1,405.02 = 625.30 : x
2. Step 2: Convert to fraction form
   1,018.42/1,405.02 = 625.30/x
3. Step 3: Cross multiply
   1,018.42x = 1,405.02 × 625.30
4. Step 4: Simplify right side
   1,018.42x = 878,559.01
5. Step 5: Solve for x
   x = 878,559.01/1,018.42
6. Step 6: Final answer
   x = 862.67