Finding the Fourth Proportional to 2,176.39, 3,260.47 and 1,687.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,176.39 : 3,260.47 = 1,687.05 : x
2. Step 2: Convert to fraction form
   2,176.39/3,260.47 = 1,687.05/x
3. Step 3: Cross multiply
   2,176.39x = 3,260.47 × 1,687.05
4. Step 4: Simplify right side
   2,176.39x = 5,500,575.91
5. Step 5: Solve for x
   x = 5,500,575.91/2,176.39
6. Step 6: Final answer
   x = 2,527.39