Finding the Fourth Proportional to 1,371.02, 1,892.04 and 781.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.02 : 1,892.04 = 781.61 : x
2. Step 2: Convert to fraction form
   1,371.02/1,892.04 = 781.61/x
3. Step 3: Cross multiply
   1,371.02x = 1,892.04 × 781.61
4. Step 4: Simplify right side
   1,371.02x = 1,478,837.38
5. Step 5: Solve for x
   x = 1,478,837.38/1,371.02
6. Step 6: Final answer
   x = 1,078.64