Finding the Fourth Proportional to 1,371.40, 1,892.04 and 781.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.40 : 1,892.04 = 781.59 : x
2. Step 2: Convert to fraction form
   1,371.40/1,892.04 = 781.59/x
3. Step 3: Cross multiply
   1,371.40x = 1,892.04 × 781.59
4. Step 4: Simplify right side
   1,371.40x = 1,478,803.71
5. Step 5: Solve for x
   x = 1,478,803.71/1,371.40
6. Step 6: Final answer
   x = 1,078.32