Finding the Fourth Proportional to 21,248.96, 31,794.83 and 12,820.35

Step by Step Solution

1. Step 1: Write the proportion equation
   21,248.96 : 31,794.83 = 12,820.35 : x
2. Step 2: Convert to fraction form
   21,248.96/31,794.83 = 12,820.35/x
3. Step 3: Cross multiply
   21,248.96x = 31,794.83 × 12,820.35
4. Step 4: Simplify right side
   21,248.96x = 407,620,784.69
5. Step 5: Solve for x
   x = 407,620,784.69/21,248.96
6. Step 6: Final answer
   x = 19,183.09