Finding the Fourth Proportional to 1,016.96, 1,403.14 and 623.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.96 : 1,403.14 = 623.30 : x
2. Step 2: Convert to fraction form
   1,016.96/1,403.14 = 623.30/x
3. Step 3: Cross multiply
   1,016.96x = 1,403.14 × 623.30
4. Step 4: Simplify right side
   1,016.96x = 874,574.05
5. Step 5: Solve for x
   x = 874,574.05/1,016.96
6. Step 6: Final answer
   x = 859.99