Finding the Fourth Proportional to 4,856.60, 7,280.56 and 4,120.91

Step by Step Solution

1. Step 1: Write the proportion equation
   4,856.60 : 7,280.56 = 4,120.91 : x
2. Step 2: Convert to fraction form
   4,856.60/7,280.56 = 4,120.91/x
3. Step 3: Cross multiply
   4,856.60x = 7,280.56 × 4,120.91
4. Step 4: Simplify right side
   4,856.60x = 30,002,532.51
5. Step 5: Solve for x
   x = 30,002,532.51/4,856.60
6. Step 6: Final answer
   x = 6,177.68