Finding the Fourth Proportional to 21,238.53, 29,308.89 and 12,285.84

Step by Step Solution

1. Step 1: Write the proportion equation
   21,238.53 : 29,308.89 = 12,285.84 : x
2. Step 2: Convert to fraction form
   21,238.53/29,308.89 = 12,285.84/x
3. Step 3: Cross multiply
   21,238.53x = 29,308.89 × 12,285.84
4. Step 4: Simplify right side
   21,238.53x = 360,084,333.12
5. Step 5: Solve for x
   x = 360,084,333.12/21,238.53
6. Step 6: Final answer
   x = 16,954.30