Finding the Fourth Proportional to 21,216.54, 31,822.56 and 8,738.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,216.54 : 31,822.56 = 8,738.10 : x
2. Step 2: Convert to fraction form
   21,216.54/31,822.56 = 8,738.10/x
3. Step 3: Cross multiply
   21,216.54x = 31,822.56 × 8,738.10
4. Step 4: Simplify right side
   21,216.54x = 278,068,711.54
5. Step 5: Solve for x
   x = 278,068,711.54/21,216.54
6. Step 6: Final answer
   x = 13,106.22