Finding the Fourth Proportional to 21,606, 29,816.37 and 12,174.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,606 : 29,816.37 = 12,174.72 : x
2. Step 2: Convert to fraction form
   21,606/29,816.37 = 12,174.72/x
3. Step 3: Cross multiply
   21,606x = 29,816.37 × 12,174.72
4. Step 4: Simplify right side
   21,606x = 363,005,956.17
5. Step 5: Solve for x
   x = 363,005,956.17/21,606
6. Step 6: Final answer
   x = 16,801.16