Finding the Fourth Proportional to 1,426.20, 1,967.47 and 928.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.20 : 1,967.47 = 928.65 : x
2. Step 2: Convert to fraction form
   1,426.20/1,967.47 = 928.65/x
3. Step 3: Cross multiply
   1,426.20x = 1,967.47 × 928.65
4. Step 4: Simplify right side
   1,426.20x = 1,827,091.02
5. Step 5: Solve for x
   x = 1,827,091.02/1,426.20
6. Step 6: Final answer
   x = 1,281.09