Finding the Fourth Proportional to 21,816.72, 32,710.48 and 8,665.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,816.72 : 32,710.48 = 8,665.56 : x
2. Step 2: Convert to fraction form
   21,816.72/32,710.48 = 8,665.56/x
3. Step 3: Cross multiply
   21,816.72x = 32,710.48 × 8,665.56
4. Step 4: Simplify right side
   21,816.72x = 283,454,627.07
5. Step 5: Solve for x
   x = 283,454,627.07/21,816.72
6. Step 6: Final answer
   x = 12,992.54