Finding the Fourth Proportional to 1,425.70, 1,966.83 and 928.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.70 : 1,966.83 = 928.41 : x
2. Step 2: Convert to fraction form
   1,425.70/1,966.83 = 928.41/x
3. Step 3: Cross multiply
   1,425.70x = 1,966.83 × 928.41
4. Step 4: Simplify right side
   1,425.70x = 1,826,030.07
5. Step 5: Solve for x
   x = 1,826,030.07/1,425.70
6. Step 6: Final answer
   x = 1,280.79