Finding the Fourth Proportional to 20,969.99, 31,440.40 and 7,818.83

Step by Step Solution

1. Step 1: Write the proportion equation
   20,969.99 : 31,440.40 = 7,818.83 : x
2. Step 2: Convert to fraction form
   20,969.99/31,440.40 = 7,818.83/x
3. Step 3: Cross multiply
   20,969.99x = 31,440.40 × 7,818.83
4. Step 4: Simplify right side
   20,969.99x = 245,827,142.73
5. Step 5: Solve for x
   x = 245,827,142.73/20,969.99
6. Step 6: Final answer
   x = 11,722.81