Finding the Fourth Proportional to 1,017.48, 1,404.30 and 624.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.48 : 1,404.30 = 624.45 : x
2. Step 2: Convert to fraction form
   1,017.48/1,404.30 = 624.45/x
3. Step 3: Cross multiply
   1,017.48x = 1,404.30 × 624.45
4. Step 4: Simplify right side
   1,017.48x = 876,915.14
5. Step 5: Solve for x
   x = 876,915.14/1,017.48
6. Step 6: Final answer
   x = 861.85