Finding the Fourth Proportional to 10,920.71, 15,069.33 and 6,139.69

Step by Step Solution

1. Step 1: Write the proportion equation
   10,920.71 : 15,069.33 = 6,139.69 : x
2. Step 2: Convert to fraction form
   10,920.71/15,069.33 = 6,139.69/x
3. Step 3: Cross multiply
   10,920.71x = 15,069.33 × 6,139.69
4. Step 4: Simplify right side
   10,920.71x = 92,520,977.03
5. Step 5: Solve for x
   x = 92,520,977.03/10,920.71
6. Step 6: Final answer
   x = 8,472.06