Finding the Fourth Proportional to 1,425.81, 1,966.50 and 928.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.81 : 1,966.50 = 928.61 : x
2. Step 2: Convert to fraction form
   1,425.81/1,966.50 = 928.61/x
3. Step 3: Cross multiply
   1,425.81x = 1,966.50 × 928.61
4. Step 4: Simplify right side
   1,425.81x = 1,826,101.73
5. Step 5: Solve for x
   x = 1,826,101.73/1,425.81
6. Step 6: Final answer
   x = 1,280.75