Finding the Fourth Proportional to 22,447.72, 30,977.98 and 13,021.88

Step by Step Solution

1. Step 1: Write the proportion equation
   22,447.72 : 30,977.98 = 13,021.88 : x
2. Step 2: Convert to fraction form
   22,447.72/30,977.98 = 13,021.88/x
3. Step 3: Cross multiply
   22,447.72x = 30,977.98 × 13,021.88
4. Step 4: Simplify right side
   22,447.72x = 403,391,538.20
5. Step 5: Solve for x
   x = 403,391,538.20/22,447.72
6. Step 6: Final answer
   x = 17,970.27