Finding the Fourth Proportional to 1,591.97, 2,196.80 and 928.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.97 : 2,196.80 = 928.74 : x
2. Step 2: Convert to fraction form
   1,591.97/2,196.80 = 928.74/x
3. Step 3: Cross multiply
   1,591.97x = 2,196.80 × 928.74
4. Step 4: Simplify right side
   1,591.97x = 2,040,256.03
5. Step 5: Solve for x
   x = 2,040,256.03/1,591.97
6. Step 6: Final answer
   x = 1,281.59