Finding the Fourth Proportional to 20,887.98, 28,809.12 and 12,934.62

Step by Step Solution

1. Step 1: Write the proportion equation
   20,887.98 : 28,809.12 = 12,934.62 : x
2. Step 2: Convert to fraction form
   20,887.98/28,809.12 = 12,934.62/x
3. Step 3: Cross multiply
   20,887.98x = 28,809.12 × 12,934.62
4. Step 4: Simplify right side
   20,887.98x = 372,635,019.73
5. Step 5: Solve for x
   x = 372,635,019.73/20,887.98
6. Step 6: Final answer
   x = 17,839.69