Finding the Fourth Proportional to 1,018.51, 1,404.88 and 625.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.51 : 1,404.88 = 625.39 : x
2. Step 2: Convert to fraction form
   1,018.51/1,404.88 = 625.39/x
3. Step 3: Cross multiply
   1,018.51x = 1,404.88 × 625.39
4. Step 4: Simplify right side
   1,018.51x = 878,594.78
5. Step 5: Solve for x
   x = 878,594.78/1,018.51
6. Step 6: Final answer
   x = 862.63