Finding the Fourth Proportional to 1,017.96, 1,404.81 and 624.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.96 : 1,404.81 = 624.76 : x
2. Step 2: Convert to fraction form
   1,017.96/1,404.81 = 624.76/x
3. Step 3: Cross multiply
   1,017.96x = 1,404.81 × 624.76
4. Step 4: Simplify right side
   1,017.96x = 877,669.10
5. Step 5: Solve for x
   x = 877,669.10/1,017.96
6. Step 6: Final answer
   x = 862.18