Finding the Fourth Proportional to 21,132.42, 31,694.18 and 13,613.46

Step by Step Solution

1. Step 1: Write the proportion equation
   21,132.42 : 31,694.18 = 13,613.46 : x
2. Step 2: Convert to fraction form
   21,132.42/31,694.18 = 13,613.46/x
3. Step 3: Cross multiply
   21,132.42x = 31,694.18 × 13,613.46
4. Step 4: Simplify right side
   21,132.42x = 431,467,383.60
5. Step 5: Solve for x
   x = 431,467,383.60/21,132.42
6. Step 6: Final answer
   x = 20,417.32