Finding the Fourth Proportional to 1,016.28, 1,402.56 and 623.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.28 : 1,402.56 = 623.52 : x
2. Step 2: Convert to fraction form
   1,016.28/1,402.56 = 623.52/x
3. Step 3: Cross multiply
   1,016.28x = 1,402.56 × 623.52
4. Step 4: Simplify right side
   1,016.28x = 874,524.21
5. Step 5: Solve for x
   x = 874,524.21/1,016.28
6. Step 6: Final answer
   x = 860.52