Finding the Fourth Proportional to 21,439.89, 32,139.99 and 11,567.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,439.89 : 32,139.99 = 11,567.61 : x
2. Step 2: Convert to fraction form
   21,439.89/32,139.99 = 11,567.61/x
3. Step 3: Cross multiply
   21,439.89x = 32,139.99 × 11,567.61
4. Step 4: Simplify right side
   21,439.89x = 371,782,869.72
5. Step 5: Solve for x
   x = 371,782,869.72/21,439.89
6. Step 6: Final answer
   x = 17,340.71