Finding the Fourth Proportional to 1,038.29, 1,433.15 and 618.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,038.29 : 1,433.15 = 618.93 : x
2. Step 2: Convert to fraction form
   1,038.29/1,433.15 = 618.93/x
3. Step 3: Cross multiply
   1,038.29x = 1,433.15 × 618.93
4. Step 4: Simplify right side
   1,038.29x = 887,016.43
5. Step 5: Solve for x
   x = 887,016.43/1,038.29
6. Step 6: Final answer
   x = 854.31