Finding the Fourth Proportional to 1,017.51, 1,404.17 and 624.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.51 : 1,404.17 = 624.39 : x
2. Step 2: Convert to fraction form
   1,017.51/1,404.17 = 624.39/x
3. Step 3: Cross multiply
   1,017.51x = 1,404.17 × 624.39
4. Step 4: Simplify right side
   1,017.51x = 876,749.71
5. Step 5: Solve for x
   x = 876,749.71/1,017.51
6. Step 6: Final answer
   x = 861.66