Finding the Fourth Proportional to 5,149.56, 7,722.72 and 1,686

Step by Step Solution

1. Step 1: Write the proportion equation
   5,149.56 : 7,722.72 = 1,686 : x
2. Step 2: Convert to fraction form
   5,149.56/7,722.72 = 1,686/x
3. Step 3: Cross multiply
   5,149.56x = 7,722.72 × 1,686
4. Step 4: Simplify right side
   5,149.56x = 13,020,505.92
5. Step 5: Solve for x
   x = 13,020,505.92/5,149.56
6. Step 6: Final answer
   x = 2,528.47