Finding the Fourth Proportional to 21,610.29, 29,821.45 and 12,657.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,610.29 : 29,821.45 = 12,657.60 : x
2. Step 2: Convert to fraction form
   21,610.29/29,821.45 = 12,657.60/x
3. Step 3: Cross multiply
   21,610.29x = 29,821.45 × 12,657.60
4. Step 4: Simplify right side
   21,610.29x = 377,468,156.82
5. Step 5: Solve for x
   x = 377,468,156.82/21,610.29
6. Step 6: Final answer
   x = 17,467.05