Finding the Fourth Proportional to 3,086.72, 4,259.69 and 1,689.47

Step by Step Solution

1. Step 1: Write the proportion equation
   3,086.72 : 4,259.69 = 1,689.47 : x
2. Step 2: Convert to fraction form
   3,086.72/4,259.69 = 1,689.47/x
3. Step 3: Cross multiply
   3,086.72x = 4,259.69 × 1,689.47
4. Step 4: Simplify right side
   3,086.72x = 7,196,611.03
5. Step 5: Solve for x
   x = 7,196,611.03/3,086.72
6. Step 6: Final answer
   x = 2,331.48