Finding the Fourth Proportional to 1,017.87, 1,404.69 and 624.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.87 : 1,404.69 = 624.75 : x
2. Step 2: Convert to fraction form
   1,017.87/1,404.69 = 624.75/x
3. Step 3: Cross multiply
   1,017.87x = 1,404.69 × 624.75
4. Step 4: Simplify right side
   1,017.87x = 877,580.08
5. Step 5: Solve for x
   x = 877,580.08/1,017.87
6. Step 6: Final answer
   x = 862.17