Finding the Fourth Proportional to 5,128.56, 7,694.34 and 1,665.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128.56 : 7,694.34 = 1,665.72 : x
2. Step 2: Convert to fraction form
   5,128.56/7,694.34 = 1,665.72/x
3. Step 3: Cross multiply
   5,128.56x = 7,694.34 × 1,665.72
4. Step 4: Simplify right side
   5,128.56x = 12,816,616.02
5. Step 5: Solve for x
   x = 12,816,616.02/5,128.56
6. Step 6: Final answer
   x = 2,499.07