Finding the Fourth Proportional to 1,017.70, 1,404.35 and 624.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.70 : 1,404.35 = 624.72 : x
2. Step 2: Convert to fraction form
   1,017.70/1,404.35 = 624.72/x
3. Step 3: Cross multiply
   1,017.70x = 1,404.35 × 624.72
4. Step 4: Simplify right side
   1,017.70x = 877,330.02
5. Step 5: Solve for x
   x = 877,330.02/1,017.70
6. Step 6: Final answer
   x = 862.07