Finding the Fourth Proportional to 11,170.79, 15,431.71 and 8,929.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,170.79 : 15,431.71 = 8,929.72 : x
2. Step 2: Convert to fraction form
   11,170.79/15,431.71 = 8,929.72/x
3. Step 3: Cross multiply
   11,170.79x = 15,431.71 × 8,929.72
4. Step 4: Simplify right side
   11,170.79x = 137,800,849.42
5. Step 5: Solve for x
   x = 137,800,849.42/11,170.79
6. Step 6: Final answer
   x = 12,335.82