Finding the Fourth Proportional to 1,040.41, 1,435.13 and 620.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.41 : 1,435.13 = 620.50 : x
2. Step 2: Convert to fraction form
   1,040.41/1,435.13 = 620.50/x
3. Step 3: Cross multiply
   1,040.41x = 1,435.13 × 620.50
4. Step 4: Simplify right side
   1,040.41x = 890,487.89
5. Step 5: Solve for x
   x = 890,487.89/1,040.41
6. Step 6: Final answer
   x = 855.90