Finding the Fourth Proportional to 1,425.86, 1,966.56 and 928.66

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.86 : 1,966.56 = 928.66 : x
2. Step 2: Convert to fraction form
   1,425.86/1,966.56 = 928.66/x
3. Step 3: Cross multiply
   1,425.86x = 1,966.56 × 928.66
4. Step 4: Simplify right side
   1,425.86x = 1,826,265.61
5. Step 5: Solve for x
   x = 1,826,265.61/1,425.86
6. Step 6: Final answer
   x = 1,280.82