Finding the Fourth Proportional to 1,371.24, 1,892.61 and 781.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.24 : 1,892.61 = 781.92 : x
2. Step 2: Convert to fraction form
   1,371.24/1,892.61 = 781.92/x
3. Step 3: Cross multiply
   1,371.24x = 1,892.61 × 781.92
4. Step 4: Simplify right side
   1,371.24x = 1,479,869.61
5. Step 5: Solve for x
   x = 1,479,869.61/1,371.24
6. Step 6: Final answer
   x = 1,079.22