Finding the Fourth Proportional to 21,723.50, 29,978.43 and 11,787.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,723.50 : 29,978.43 = 11,787.50 : x
2. Step 2: Convert to fraction form
   21,723.50/29,978.43 = 11,787.50/x
3. Step 3: Cross multiply
   21,723.50x = 29,978.43 × 11,787.50
4. Step 4: Simplify right side
   21,723.50x = 353,370,743.63
5. Step 5: Solve for x
   x = 353,370,743.63/21,723.50
6. Step 6: Final answer
   x = 16,266.75