Finding the Fourth Proportional to 21,613.20, 32,192.50 and 20,602

Step by Step Solution

1. Step 1: Write the proportion equation
   21,613.20 : 32,192.50 = 20,602 : x
2. Step 2: Convert to fraction form
   21,613.20/32,192.50 = 20,602/x
3. Step 3: Cross multiply
   21,613.20x = 32,192.50 × 20,602
4. Step 4: Simplify right side
   21,613.20x = 663,229,885
5. Step 5: Solve for x
   x = 663,229,885/21,613.20
6. Step 6: Final answer
   x = 30,686.33