Finding the Fourth Proportional to 20,796.28, 31,201.74 and 12,996.04

Step by Step Solution

1. Step 1: Write the proportion equation
   20,796.28 : 31,201.74 = 12,996.04 : x
2. Step 2: Convert to fraction form
   20,796.28/31,201.74 = 12,996.04/x
3. Step 3: Cross multiply
   20,796.28x = 31,201.74 × 12,996.04
4. Step 4: Simplify right side
   20,796.28x = 405,499,061.11
5. Step 5: Solve for x
   x = 405,499,061.11/20,796.28
6. Step 6: Final answer
   x = 19,498.63