Finding the Fourth Proportional to 1,426.35, 1,969.59 and 928.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.35 : 1,969.59 = 928.80 : x
2. Step 2: Convert to fraction form
   1,426.35/1,969.59 = 928.80/x
3. Step 3: Cross multiply
   1,426.35x = 1,969.59 × 928.80
4. Step 4: Simplify right side
   1,426.35x = 1,829,355.19
5. Step 5: Solve for x
   x = 1,829,355.19/1,426.35
6. Step 6: Final answer
   x = 1,282.54