Finding the Fourth Proportional to 21,345.72, 29,458.71 and 11,787.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,345.72 : 29,458.71 = 11,787.43 : x
2. Step 2: Convert to fraction form
   21,345.72/29,458.71 = 11,787.43/x
3. Step 3: Cross multiply
   21,345.72x = 29,458.71 × 11,787.43
4. Step 4: Simplify right side
   21,345.72x = 347,242,408.37
5. Step 5: Solve for x
   x = 347,242,408.37/21,345.72
6. Step 6: Final answer
   x = 16,267.54