Finding the Fourth Proportional to 21,603.12, 29,819.76 and 12,653.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,603.12 : 29,819.76 = 12,653.50 : x
2. Step 2: Convert to fraction form
   21,603.12/29,819.76 = 12,653.50/x
3. Step 3: Cross multiply
   21,603.12x = 29,819.76 × 12,653.50
4. Step 4: Simplify right side
   21,603.12x = 377,324,333.16
5. Step 5: Solve for x
   x = 377,324,333.16/21,603.12
6. Step 6: Final answer
   x = 17,466.20