Finding the Fourth Proportional to 1,371.43, 1,892.45 and 781.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.43 : 1,892.45 = 781.95 : x
2. Step 2: Convert to fraction form
   1,371.43/1,892.45 = 781.95/x
3. Step 3: Cross multiply
   1,371.43x = 1,892.45 × 781.95
4. Step 4: Simplify right side
   1,371.43x = 1,479,803.23
5. Step 5: Solve for x
   x = 1,479,803.23/1,371.43
6. Step 6: Final answer
   x = 1,079.02