Finding the Fourth Proportional to 21,967.98, 32,887.38 and 13,621.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,967.98 : 32,887.38 = 13,621.20 : x
2. Step 2: Convert to fraction form
   21,967.98/32,887.38 = 13,621.20/x
3. Step 3: Cross multiply
   21,967.98x = 32,887.38 × 13,621.20
4. Step 4: Simplify right side
   21,967.98x = 447,965,580.46
5. Step 5: Solve for x
   x = 447,965,580.46/21,967.98
6. Step 6: Final answer
   x = 20,391.75