Finding the Fourth Proportional to 20,849.40, 31,196.34 and 20,616.12

Step by Step Solution

1. Step 1: Write the proportion equation
   20,849.40 : 31,196.34 = 20,616.12 : x
2. Step 2: Convert to fraction form
   20,849.40/31,196.34 = 20,616.12/x
3. Step 3: Cross multiply
   20,849.40x = 31,196.34 × 20,616.12
4. Step 4: Simplify right side
   20,849.40x = 643,147,489.00
5. Step 5: Solve for x
   x = 643,147,489.00/20,849.40
6. Step 6: Final answer
   x = 30,847.29