Finding the Fourth Proportional to 21,921.07, 32,889.89 and 13,162.09

Step by Step Solution

1. Step 1: Write the proportion equation
   21,921.07 : 32,889.89 = 13,162.09 : x
2. Step 2: Convert to fraction form
   21,921.07/32,889.89 = 13,162.09/x
3. Step 3: Cross multiply
   21,921.07x = 32,889.89 × 13,162.09
4. Step 4: Simplify right side
   21,921.07x = 432,899,692.27
5. Step 5: Solve for x
   x = 432,899,692.27/21,921.07
6. Step 6: Final answer
   x = 19,748.11