Finding the Fourth Proportional to 1,371.29, 1,892.38 and 781.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.29 : 1,892.38 = 781.83 : x
2. Step 2: Convert to fraction form
   1,371.29/1,892.38 = 781.83/x
3. Step 3: Cross multiply
   1,371.29x = 1,892.38 × 781.83
4. Step 4: Simplify right side
   1,371.29x = 1,479,506.08
5. Step 5: Solve for x
   x = 1,479,506.08/1,371.29
6. Step 6: Final answer
   x = 1,078.92