Finding the Fourth Proportional to 1,591.77, 2,196.60 and 928.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.77 : 2,196.60 = 928.75 : x
2. Step 2: Convert to fraction form
   1,591.77/2,196.60 = 928.75/x
3. Step 3: Cross multiply
   1,591.77x = 2,196.60 × 928.75
4. Step 4: Simplify right side
   1,591.77x = 2,040,092.25
5. Step 5: Solve for x
   x = 2,040,092.25/1,591.77
6. Step 6: Final answer
   x = 1,281.65