Finding the Fourth Proportional to 1,040.43, 1,435.16 and 620.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.43 : 1,435.16 = 620.49 : x
2. Step 2: Convert to fraction form
   1,040.43/1,435.16 = 620.49/x
3. Step 3: Cross multiply
   1,040.43x = 1,435.16 × 620.49
4. Step 4: Simplify right side
   1,040.43x = 890,499.33
5. Step 5: Solve for x
   x = 890,499.33/1,040.43
6. Step 6: Final answer
   x = 855.90