Finding the Fourth Proportional to 15,510.31, 21,403.78 and 8,796.56

Step by Step Solution

1. Step 1: Write the proportion equation
   15,510.31 : 21,403.78 = 8,796.56 : x
2. Step 2: Convert to fraction form
   15,510.31/21,403.78 = 8,796.56/x
3. Step 3: Cross multiply
   15,510.31x = 21,403.78 × 8,796.56
4. Step 4: Simplify right side
   15,510.31x = 188,279,505.99
5. Step 5: Solve for x
   x = 188,279,505.99/15,510.31
6. Step 6: Final answer
   x = 12,138.99