Finding the Fourth Proportional to 1,040.50, 1,436.18 and 620.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.50 : 1,436.18 = 620.71 : x
2. Step 2: Convert to fraction form
   1,040.50/1,436.18 = 620.71/x
3. Step 3: Cross multiply
   1,040.50x = 1,436.18 × 620.71
4. Step 4: Simplify right side
   1,040.50x = 891,451.29
5. Step 5: Solve for x
   x = 891,451.29/1,040.50
6. Step 6: Final answer
   x = 856.75