Finding the Fourth Proportional to 1,016.82, 1,403.31 and 624.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.82 : 1,403.31 = 624.10 : x
2. Step 2: Convert to fraction form
   1,016.82/1,403.31 = 624.10/x
3. Step 3: Cross multiply
   1,016.82x = 1,403.31 × 624.10
4. Step 4: Simplify right side
   1,016.82x = 875,805.77
5. Step 5: Solve for x
   x = 875,805.77/1,016.82
6. Step 6: Final answer
   x = 861.32