Finding the Fourth Proportional to 21,610.50, 32,419.67 and 10,517.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,610.50 : 32,419.67 = 10,517.20 : x
2. Step 2: Convert to fraction form
   21,610.50/32,419.67 = 10,517.20/x
3. Step 3: Cross multiply
   21,610.50x = 32,419.67 × 10,517.20
4. Step 4: Simplify right side
   21,610.50x = 340,964,153.32
5. Step 5: Solve for x
   x = 340,964,153.32/21,610.50
6. Step 6: Final answer
   x = 15,777.71