Finding the Fourth Proportional to 1,016.02, 1,402.79 and 623.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.02 : 1,402.79 = 623.72 : x
2. Step 2: Convert to fraction form
   1,016.02/1,402.79 = 623.72/x
3. Step 3: Cross multiply
   1,016.02x = 1,402.79 × 623.72
4. Step 4: Simplify right side
   1,016.02x = 874,948.57
5. Step 5: Solve for x
   x = 874,948.57/1,016.02
6. Step 6: Final answer
   x = 861.15