Finding the Fourth Proportional to 1,016.28, 1,403.30 and 623.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.28 : 1,403.30 = 623.56 : x
2. Step 2: Convert to fraction form
   1,016.28/1,403.30 = 623.56/x
3. Step 3: Cross multiply
   1,016.28x = 1,403.30 × 623.56
4. Step 4: Simplify right side
   1,016.28x = 875,041.75
5. Step 5: Solve for x
   x = 875,041.75/1,016.28
6. Step 6: Final answer
   x = 861.02