Finding the Fourth Proportional to 1,016.09, 1,402.20 and 623.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.09 : 1,402.20 = 623.10 : x
2. Step 2: Convert to fraction form
   1,016.09/1,402.20 = 623.10/x
3. Step 3: Cross multiply
   1,016.09x = 1,402.20 × 623.10
4. Step 4: Simplify right side
   1,016.09x = 873,710.82
5. Step 5: Solve for x
   x = 873,710.82/1,016.09
6. Step 6: Final answer
   x = 859.88