Finding the Fourth Proportional to 21,635.72, 29,860.04 and 12,559.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,635.72 : 29,860.04 = 12,559.15 : x
2. Step 2: Convert to fraction form
   21,635.72/29,860.04 = 12,559.15/x
3. Step 3: Cross multiply
   21,635.72x = 29,860.04 × 12,559.15
4. Step 4: Simplify right side
   21,635.72x = 375,016,509.27
5. Step 5: Solve for x
   x = 375,016,509.27/21,635.72
6. Step 6: Final answer
   x = 17,333.21