Finding the Fourth Proportional to 1,591.46, 2,196.24 and 928.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.46 : 2,196.24 = 928.40 : x
2. Step 2: Convert to fraction form
   1,591.46/2,196.24 = 928.40/x
3. Step 3: Cross multiply
   1,591.46x = 2,196.24 × 928.40
4. Step 4: Simplify right side
   1,591.46x = 2,038,989.22
5. Step 5: Solve for x
   x = 2,038,989.22/1,591.46
6. Step 6: Final answer
   x = 1,281.21