Finding the Fourth Proportional to 1,340.56, 1,851.42 and 1,291.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.56 : 1,851.42 = 1,291.96 : x
2. Step 2: Convert to fraction form
   1,340.56/1,851.42 = 1,291.96/x
3. Step 3: Cross multiply
   1,340.56x = 1,851.42 × 1,291.96
4. Step 4: Simplify right side
   1,340.56x = 2,391,960.58
5. Step 5: Solve for x
   x = 2,391,960.58/1,340.56
6. Step 6: Final answer
   x = 1,784.30