Finding the Fourth Proportional to 21,200.81, 29,260.71 and 12,253.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,200.81 : 29,260.71 = 12,253.49 : x
2. Step 2: Convert to fraction form
   21,200.81/29,260.71 = 12,253.49/x
3. Step 3: Cross multiply
   21,200.81x = 29,260.71 × 12,253.49
4. Step 4: Simplify right side
   21,200.81x = 358,545,945.39
5. Step 5: Solve for x
   x = 358,545,945.39/21,200.81
6. Step 6: Final answer
   x = 16,911.90