Finding the Fourth Proportional to 1,340.51, 1,849.92 and 781.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.51 : 1,849.92 = 781.31 : x
2. Step 2: Convert to fraction form
   1,340.51/1,849.92 = 781.31/x
3. Step 3: Cross multiply
   1,340.51x = 1,849.92 × 781.31
4. Step 4: Simplify right side
   1,340.51x = 1,445,361.00
5. Step 5: Solve for x
   x = 1,445,361.00/1,340.51
6. Step 6: Final answer
   x = 1,078.22