Finding the Fourth Proportional to 21,504.72, 29,665.32 and 13,531.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,504.72 : 29,665.32 = 13,531.92 : x
2. Step 2: Convert to fraction form
   21,504.72/29,665.32 = 13,531.92/x
3. Step 3: Cross multiply
   21,504.72x = 29,665.32 × 13,531.92
4. Step 4: Simplify right side
   21,504.72x = 401,428,737.01
5. Step 5: Solve for x
   x = 401,428,737.01/21,504.72
6. Step 6: Final answer
   x = 18,667.01