Finding the Fourth Proportional to 21,604.32, 29,814.96 and 12,173.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,604.32 : 29,814.96 = 12,173.28 : x
2. Step 2: Convert to fraction form
   21,604.32/29,814.96 = 12,173.28/x
3. Step 3: Cross multiply
   21,604.32x = 29,814.96 × 12,173.28
4. Step 4: Simplify right side
   21,604.32x = 362,945,856.27
5. Step 5: Solve for x
   x = 362,945,856.27/21,604.32
6. Step 6: Final answer
   x = 16,799.69