Finding the Fourth Proportional to 1,371.05, 1,892.13 and 781.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.05 : 1,892.13 = 781.58 : x
2. Step 2: Convert to fraction form
   1,371.05/1,892.13 = 781.58/x
3. Step 3: Cross multiply
   1,371.05x = 1,892.13 × 781.58
4. Step 4: Simplify right side
   1,371.05x = 1,478,841.50
5. Step 5: Solve for x
   x = 1,478,841.50/1,371.05
6. Step 6: Final answer
   x = 1,078.62