Finding the Fourth Proportional to 2,117.30, 3,170.55 and 1,685.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.30 : 3,170.55 = 1,685.30 : x
2. Step 2: Convert to fraction form
   2,117.30/3,170.55 = 1,685.30/x
3. Step 3: Cross multiply
   2,117.30x = 3,170.55 × 1,685.30
4. Step 4: Simplify right side
   2,117.30x = 5,343,327.92
5. Step 5: Solve for x
   x = 5,343,327.92/2,117.30
6. Step 6: Final answer
   x = 2,523.65