Finding the Fourth Proportional to 21,615.89, 29,837.37 and 12,666.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,615.89 : 29,837.37 = 12,666.29 : x
2. Step 2: Convert to fraction form
   21,615.89/29,837.37 = 12,666.29/x
3. Step 3: Cross multiply
   21,615.89x = 29,837.37 × 12,666.29
4. Step 4: Simplify right side
   21,615.89x = 377,928,632.07
5. Step 5: Solve for x
   x = 377,928,632.07/21,615.89
6. Step 6: Final answer
   x = 17,483.84