Finding the Fourth Proportional to 3,061.28, 4,591.58 and 840.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,061.28 : 4,591.58 = 840.28 : x
2. Step 2: Convert to fraction form
   3,061.28/4,591.58 = 840.28/x
3. Step 3: Cross multiply
   3,061.28x = 4,591.58 × 840.28
4. Step 4: Simplify right side
   3,061.28x = 3,858,224.59
5. Step 5: Solve for x
   x = 3,858,224.59/3,061.28
6. Step 6: Final answer
   x = 1,260.33