Finding the Fourth Proportional to 20,947.33, 28,904.09 and 12,446.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,947.33 : 28,904.09 = 12,446.31 : x
2. Step 2: Convert to fraction form
   20,947.33/28,904.09 = 12,446.31/x
3. Step 3: Cross multiply
   20,947.33x = 28,904.09 × 12,446.31
4. Step 4: Simplify right side
   20,947.33x = 359,749,264.41
5. Step 5: Solve for x
   x = 359,749,264.41/20,947.33
6. Step 6: Final answer
   x = 17,173.99