Finding the Fourth Proportional to 2,071.67, 3,109.55 and 1,686.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.67 : 3,109.55 = 1,686.20 : x
2. Step 2: Convert to fraction form
   2,071.67/3,109.55 = 1,686.20/x
3. Step 3: Cross multiply
   2,071.67x = 3,109.55 × 1,686.20
4. Step 4: Simplify right side
   2,071.67x = 5,243,299.23
5. Step 5: Solve for x
   x = 5,243,299.23/2,071.67
6. Step 6: Final answer
   x = 2,530.96