Finding the Fourth Proportional to 20,788.43, 28,686.71 and 11,357

Step by Step Solution

1. Step 1: Write the proportion equation
   20,788.43 : 28,686.71 = 11,357 : x
2. Step 2: Convert to fraction form
   20,788.43/28,686.71 = 11,357/x
3. Step 3: Cross multiply
   20,788.43x = 28,686.71 × 11,357
4. Step 4: Simplify right side
   20,788.43x = 325,794,965.47
5. Step 5: Solve for x
   x = 325,794,965.47/20,788.43
6. Step 6: Final answer
   x = 15,671.94