Finding the Fourth Proportional to 10,956.69, 15,120.21 and 5,920.91

Step by Step Solution

1. Step 1: Write the proportion equation
   10,956.69 : 15,120.21 = 5,920.91 : x
2. Step 2: Convert to fraction form
   10,956.69/15,120.21 = 5,920.91/x
3. Step 3: Cross multiply
   10,956.69x = 15,120.21 × 5,920.91
4. Step 4: Simplify right side
   10,956.69x = 89,525,326.99
5. Step 5: Solve for x
   x = 89,525,326.99/10,956.69
6. Step 6: Final answer
   x = 8,170.84