Finding the Fourth Proportional to 1,017.58, 1,404.17 and 624.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.58 : 1,404.17 = 624.60 : x
2. Step 2: Convert to fraction form
   1,017.58/1,404.17 = 624.60/x
3. Step 3: Cross multiply
   1,017.58x = 1,404.17 × 624.60
4. Step 4: Simplify right side
   1,017.58x = 877,044.58
5. Step 5: Solve for x
   x = 877,044.58/1,017.58
6. Step 6: Final answer
   x = 861.89