Finding the Fourth Proportional to 10,698.48, 16,031.52 and 7,920.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,698.48 : 16,031.52 = 7,920.72 : x
2. Step 2: Convert to fraction form
   10,698.48/16,031.52 = 7,920.72/x
3. Step 3: Cross multiply
   10,698.48x = 16,031.52 × 7,920.72
4. Step 4: Simplify right side
   10,698.48x = 126,981,181.09
5. Step 5: Solve for x
   x = 126,981,181.09/10,698.48
6. Step 6: Final answer
   x = 11,869.09