Finding the Fourth Proportional to 1,017.46, 1,403.83 and 623.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.46 : 1,403.83 = 623.80 : x
2. Step 2: Convert to fraction form
   1,017.46/1,403.83 = 623.80/x
3. Step 3: Cross multiply
   1,017.46x = 1,403.83 × 623.80
4. Step 4: Simplify right side
   1,017.46x = 875,709.15
5. Step 5: Solve for x
   x = 875,709.15/1,017.46
6. Step 6: Final answer
   x = 860.68