Finding the Fourth Proportional to 1,371.26, 1,892.50 and 781.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.26 : 1,892.50 = 781.89 : x
2. Step 2: Convert to fraction form
   1,371.26/1,892.50 = 781.89/x
3. Step 3: Cross multiply
   1,371.26x = 1,892.50 × 781.89
4. Step 4: Simplify right side
   1,371.26x = 1,479,724.87
5. Step 5: Solve for x
   x = 1,479,724.87/1,371.26
6. Step 6: Final answer
   x = 1,079.10