Finding the Fourth Proportional to 1,022.82, 1,411.30 and 624.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022.82 : 1,411.30 = 624.40 : x
2. Step 2: Convert to fraction form
   1,022.82/1,411.30 = 624.40/x
3. Step 3: Cross multiply
   1,022.82x = 1,411.30 × 624.40
4. Step 4: Simplify right side
   1,022.82x = 881,215.72
5. Step 5: Solve for x
   x = 881,215.72/1,022.82
6. Step 6: Final answer
   x = 861.56