Finding the Fourth Proportional to 21,997.36, 30,354.78 and 12,565.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,997.36 : 30,354.78 = 12,565.72 : x
2. Step 2: Convert to fraction form
   21,997.36/30,354.78 = 12,565.72/x
3. Step 3: Cross multiply
   21,997.36x = 30,354.78 × 12,565.72
4. Step 4: Simplify right side
   21,997.36x = 381,429,666.14
5. Step 5: Solve for x
   x = 381,429,666.14/21,997.36
6. Step 6: Final answer
   x = 17,339.79