Finding the Fourth Proportional to 1,016.04, 1,401.40 and 623.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.04 : 1,401.40 = 623.28 : x
2. Step 2: Convert to fraction form
   1,016.04/1,401.40 = 623.28/x
3. Step 3: Cross multiply
   1,016.04x = 1,401.40 × 623.28
4. Step 4: Simplify right side
   1,016.04x = 873,464.59
5. Step 5: Solve for x
   x = 873,464.59/1,016.04
6. Step 6: Final answer
   x = 859.68