Finding the Fourth Proportional to 1,371.41, 1,892.55 and 781.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.41 : 1,892.55 = 781.95 : x
2. Step 2: Convert to fraction form
   1,371.41/1,892.55 = 781.95/x
3. Step 3: Cross multiply
   1,371.41x = 1,892.55 × 781.95
4. Step 4: Simplify right side
   1,371.41x = 1,479,889.50
5. Step 5: Solve for x
   x = 1,479,889.50/1,371.41
6. Step 6: Final answer
   x = 1,079.10