Finding the Fourth Proportional to 6,820.69, 10,230.72 and 2,139.97

Step by Step Solution

1. Step 1: Write the proportion equation
   6,820.69 : 10,230.72 = 2,139.97 : x
2. Step 2: Convert to fraction form
   6,820.69/10,230.72 = 2,139.97/x
3. Step 3: Cross multiply
   6,820.69x = 10,230.72 × 2,139.97
4. Step 4: Simplify right side
   6,820.69x = 21,893,433.88
5. Step 5: Solve for x
   x = 21,893,433.88/6,820.69
6. Step 6: Final answer
   x = 3,209.86