Finding the Fourth Proportional to 15,510.81, 21,404.47 and 8,797.06

Step by Step Solution

1. Step 1: Write the proportion equation
   15,510.81 : 21,404.47 = 8,797.06 : x
2. Step 2: Convert to fraction form
   15,510.81/21,404.47 = 8,797.06/x
3. Step 3: Cross multiply
   15,510.81x = 21,404.47 × 8,797.06
4. Step 4: Simplify right side
   15,510.81x = 188,296,255.85
5. Step 5: Solve for x
   x = 188,296,255.85/15,510.81
6. Step 6: Final answer
   x = 12,139.68