Finding the Fourth Proportional to 1,280.54, 1,919.61 and 1,166.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.54 : 1,919.61 = 1,166.42 : x
2. Step 2: Convert to fraction form
   1,280.54/1,919.61 = 1,166.42/x
3. Step 3: Cross multiply
   1,280.54x = 1,919.61 × 1,166.42
4. Step 4: Simplify right side
   1,280.54x = 2,239,061.90
5. Step 5: Solve for x
   x = 2,239,061.90/1,280.54
6. Step 6: Final answer
   x = 1,748.53