Finding the Fourth Proportional to 1,017.15, 1,404.34 and 624.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.15 : 1,404.34 = 624.85 : x
2. Step 2: Convert to fraction form
   1,017.15/1,404.34 = 624.85/x
3. Step 3: Cross multiply
   1,017.15x = 1,404.34 × 624.85
4. Step 4: Simplify right side
   1,017.15x = 877,496.78
5. Step 5: Solve for x
   x = 877,496.78/1,017.15
6. Step 6: Final answer
   x = 862.70