Finding the Fourth Proportional to 10,920.72, 15,071.22 and 10,288.92

Step by Step Solution

1. Step 1: Write the proportion equation
   10,920.72 : 15,071.22 = 10,288.92 : x
2. Step 2: Convert to fraction form
   10,920.72/15,071.22 = 10,288.92/x
3. Step 3: Cross multiply
   10,920.72x = 15,071.22 × 10,288.92
4. Step 4: Simplify right side
   10,920.72x = 155,066,576.88
5. Step 5: Solve for x
   x = 155,066,576.88/10,920.72
6. Step 6: Final answer
   x = 14,199.30