Finding the Fourth Proportional to 1,591.76, 2,196.32 and 928.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.76 : 2,196.32 = 928.64 : x
2. Step 2: Convert to fraction form
   1,591.76/2,196.32 = 928.64/x
3. Step 3: Cross multiply
   1,591.76x = 2,196.32 × 928.64
4. Step 4: Simplify right side
   1,591.76x = 2,039,590.60
5. Step 5: Solve for x
   x = 2,039,590.60/1,591.76
6. Step 6: Final answer
   x = 1,281.34