Finding the Fourth Proportional to 15,510.65, 21,409.56 and 8,800.72

Step by Step Solution

1. Step 1: Write the proportion equation
   15,510.65 : 21,409.56 = 8,800.72 : x
2. Step 2: Convert to fraction form
   15,510.65/21,409.56 = 8,800.72/x
3. Step 3: Cross multiply
   15,510.65x = 21,409.56 × 8,800.72
4. Step 4: Simplify right side
   15,510.65x = 188,419,489.36
5. Step 5: Solve for x
   x = 188,419,489.36/15,510.65
6. Step 6: Final answer
   x = 12,147.75