Finding the Fourth Proportional to 20,337.69, 28,076.21 and 12,788.18

Step by Step Solution

1. Step 1: Write the proportion equation
   20,337.69 : 28,076.21 = 12,788.18 : x
2. Step 2: Convert to fraction form
   20,337.69/28,076.21 = 12,788.18/x
3. Step 3: Cross multiply
   20,337.69x = 28,076.21 × 12,788.18
4. Step 4: Simplify right side
   20,337.69x = 359,043,422.88
5. Step 5: Solve for x
   x = 359,043,422.88/20,337.69
6. Step 6: Final answer
   x = 17,654.09