Finding the Fourth Proportional to 1,038.40, 1,433.31 and 619.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,038.40 : 1,433.31 = 619.06 : x
2. Step 2: Convert to fraction form
   1,038.40/1,433.31 = 619.06/x
3. Step 3: Cross multiply
   1,038.40x = 1,433.31 × 619.06
4. Step 4: Simplify right side
   1,038.40x = 887,304.89
5. Step 5: Solve for x
   x = 887,304.89/1,038.40
6. Step 6: Final answer
   x = 854.49