Finding the Fourth Proportional to 1,016.80, 1,402.76 and 624.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.80 : 1,402.76 = 624.05 : x
2. Step 2: Convert to fraction form
   1,016.80/1,402.76 = 624.05/x
3. Step 3: Cross multiply
   1,016.80x = 1,402.76 × 624.05
4. Step 4: Simplify right side
   1,016.80x = 875,392.38
5. Step 5: Solve for x
   x = 875,392.38/1,016.80
6. Step 6: Final answer
   x = 860.93