Finding the Fourth Proportional to 20,796.19, 28,690.59 and 12,824.59

Step by Step Solution

1. Step 1: Write the proportion equation
   20,796.19 : 28,690.59 = 12,824.59 : x
2. Step 2: Convert to fraction form
   20,796.19/28,690.59 = 12,824.59/x
3. Step 3: Cross multiply
   20,796.19x = 28,690.59 × 12,824.59
4. Step 4: Simplify right side
   20,796.19x = 367,945,053.61
5. Step 5: Solve for x
   x = 367,945,053.61/20,796.19
6. Step 6: Final answer
   x = 17,692.91