Finding the Fourth Proportional to 1,443.30, 2,165.78 and 610.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.30 : 2,165.78 = 610.31 : x
2. Step 2: Convert to fraction form
   1,443.30/2,165.78 = 610.31/x
3. Step 3: Cross multiply
   1,443.30x = 2,165.78 × 610.31
4. Step 4: Simplify right side
   1,443.30x = 1,321,797.19
5. Step 5: Solve for x
   x = 1,321,797.19/1,443.30
6. Step 6: Final answer
   x = 915.82