Finding the Fourth Proportional to 21,364.05, 29,477.89 and 12,406.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,364.05 : 29,477.89 = 12,406.94 : x
2. Step 2: Convert to fraction form
   21,364.05/29,477.89 = 12,406.94/x
3. Step 3: Cross multiply
   21,364.05x = 29,477.89 × 12,406.94
4. Step 4: Simplify right side
   21,364.05x = 365,730,391.22
5. Step 5: Solve for x
   x = 365,730,391.22/21,364.05
6. Step 6: Final answer
   x = 17,118.96