Finding the Fourth Proportional to 21,644, 29,868.72 and 11,708

Step by Step Solution

1. Step 1: Write the proportion equation
   21,644 : 29,868.72 = 11,708 : x
2. Step 2: Convert to fraction form
   21,644/29,868.72 = 11,708/x
3. Step 3: Cross multiply
   21,644x = 29,868.72 × 11,708
4. Step 4: Simplify right side
   21,644x = 349,702,973.76
5. Step 5: Solve for x
   x = 349,702,973.76/21,644
6. Step 6: Final answer
   x = 16,157.04