Finding the Fourth Proportional to 1,591.49, 2,196.25 and 928.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.49 : 2,196.25 = 928.79 : x
2. Step 2: Convert to fraction form
   1,591.49/2,196.25 = 928.79/x
3. Step 3: Cross multiply
   1,591.49x = 2,196.25 × 928.79
4. Step 4: Simplify right side
   1,591.49x = 2,039,855.04
5. Step 5: Solve for x
   x = 2,039,855.04/1,591.49
6. Step 6: Final answer
   x = 1,281.73