Finding the Fourth Proportional to 1,017.04, 1,402.78 and 624.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.04 : 1,402.78 = 624.28 : x
2. Step 2: Convert to fraction form
   1,017.04/1,402.78 = 624.28/x
3. Step 3: Cross multiply
   1,017.04x = 1,402.78 × 624.28
4. Step 4: Simplify right side
   1,017.04x = 875,727.50
5. Step 5: Solve for x
   x = 875,727.50/1,017.04
6. Step 6: Final answer
   x = 861.06