Finding the Fourth Proportional to 5,679.29, 7,829.18 and 3,689.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,679.29 : 7,829.18 = 3,689.12 : x
2. Step 2: Convert to fraction form
   5,679.29/7,829.18 = 3,689.12/x
3. Step 3: Cross multiply
   5,679.29x = 7,829.18 × 3,689.12
4. Step 4: Simplify right side
   5,679.29x = 28,882,784.52
5. Step 5: Solve for x
   x = 28,882,784.52/5,679.29
6. Step 6: Final answer
   x = 5,085.63