Finding the Fourth Proportional to 21,351.57, 29,464.86 and 12,404.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,351.57 : 29,464.86 = 12,404.10 : x
2. Step 2: Convert to fraction form
   21,351.57/29,464.86 = 12,404.10/x
3. Step 3: Cross multiply
   21,351.57x = 29,464.86 × 12,404.10
4. Step 4: Simplify right side
   21,351.57x = 365,485,069.93
5. Step 5: Solve for x
   x = 365,485,069.93/21,351.57
6. Step 6: Final answer
   x = 17,117.48