Finding the Fourth Proportional to 21,601.71, 29,810.98 and 12,648.37

Step by Step Solution

1. Step 1: Write the proportion equation
   21,601.71 : 29,810.98 = 12,648.37 : x
2. Step 2: Convert to fraction form
   21,601.71/29,810.98 = 12,648.37/x
3. Step 3: Cross multiply
   21,601.71x = 29,810.98 × 12,648.37
4. Step 4: Simplify right side
   21,601.71x = 377,060,305.10
5. Step 5: Solve for x
   x = 377,060,305.10/21,601.71
6. Step 6: Final answer
   x = 17,455.11