Finding the Fourth Proportional to 20,820.79, 31,243.40 and 7,682.32

Step by Step Solution

1. Step 1: Write the proportion equation
   20,820.79 : 31,243.40 = 7,682.32 : x
2. Step 2: Convert to fraction form
   20,820.79/31,243.40 = 7,682.32/x
3. Step 3: Cross multiply
   20,820.79x = 31,243.40 × 7,682.32
4. Step 4: Simplify right side
   20,820.79x = 240,021,796.69
5. Step 5: Solve for x
   x = 240,021,796.69/20,820.79
6. Step 6: Final answer
   x = 11,527.99