Finding the Fourth Proportional to 1,591.79, 2,196.59 and 928.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.79 : 2,196.59 = 928.67 : x
2. Step 2: Convert to fraction form
   1,591.79/2,196.59 = 928.67/x
3. Step 3: Cross multiply
   1,591.79x = 2,196.59 × 928.67
4. Step 4: Simplify right side
   1,591.79x = 2,039,891.61
5. Step 5: Solve for x
   x = 2,039,891.61/1,591.79
6. Step 6: Final answer
   x = 1,281.51