Finding the Fourth Proportional to 5,128.10, 7,694.57 and 2,788.01

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128.10 : 7,694.57 = 2,788.01 : x
2. Step 2: Convert to fraction form
   5,128.10/7,694.57 = 2,788.01/x
3. Step 3: Cross multiply
   5,128.10x = 7,694.57 × 2,788.01
4. Step 4: Simplify right side
   5,128.10x = 21,452,485.69
5. Step 5: Solve for x
   x = 21,452,485.69/5,128.10
6. Step 6: Final answer
   x = 4,183.32