Finding the Fourth Proportional to 21,429.26, 29,574.02 and 12,356.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,429.26 : 29,574.02 = 12,356.10 : x
2. Step 2: Convert to fraction form
   21,429.26/29,574.02 = 12,356.10/x
3. Step 3: Cross multiply
   21,429.26x = 29,574.02 × 12,356.10
4. Step 4: Simplify right side
   21,429.26x = 365,419,548.52
5. Step 5: Solve for x
   x = 365,419,548.52/21,429.26
6. Step 6: Final answer
   x = 17,052.36