Finding the Fourth Proportional to 1,371.22, 1,891.82 and 781.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.22 : 1,891.82 = 781.34 : x
2. Step 2: Convert to fraction form
   1,371.22/1,891.82 = 781.34/x
3. Step 3: Cross multiply
   1,371.22x = 1,891.82 × 781.34
4. Step 4: Simplify right side
   1,371.22x = 1,478,154.64
5. Step 5: Solve for x
   x = 1,478,154.64/1,371.22
6. Step 6: Final answer
   x = 1,077.99