Finding the Fourth Proportional to 1,280.52, 1,767.42 and 814.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.52 : 1,767.42 = 814.50 : x
2. Step 2: Convert to fraction form
   1,280.52/1,767.42 = 814.50/x
3. Step 3: Cross multiply
   1,280.52x = 1,767.42 × 814.50
4. Step 4: Simplify right side
   1,280.52x = 1,439,563.59
5. Step 5: Solve for x
   x = 1,439,563.59/1,280.52
6. Step 6: Final answer
   x = 1,124.20