Finding the Fourth Proportional to 1,278.62, 1,762.71 and 1,081.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,278.62 : 1,762.71 = 1,081.34 : x
2. Step 2: Convert to fraction form
   1,278.62/1,762.71 = 1,081.34/x
3. Step 3: Cross multiply
   1,278.62x = 1,762.71 × 1,081.34
4. Step 4: Simplify right side
   1,278.62x = 1,906,088.83
5. Step 5: Solve for x
   x = 1,906,088.83/1,278.62
6. Step 6: Final answer
   x = 1,490.74