Finding the Fourth Proportional to 1,591.43, 2,196.54 and 928.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.43 : 2,196.54 = 928.40 : x
2. Step 2: Convert to fraction form
   1,591.43/2,196.54 = 928.40/x
3. Step 3: Cross multiply
   1,591.43x = 2,196.54 × 928.40
4. Step 4: Simplify right side
   1,591.43x = 2,039,256.75
5. Step 5: Solve for x
   x = 2,039,256.75/1,591.43
6. Step 6: Final answer
   x = 1,281.40