Finding the Fourth Proportional to 20,909.98, 28,843.59 and 13,457.98

Step by Step Solution

1. Step 1: Write the proportion equation
   20,909.98 : 28,843.59 = 13,457.98 : x
2. Step 2: Convert to fraction form
   20,909.98/28,843.59 = 13,457.98/x
3. Step 3: Cross multiply
   20,909.98x = 28,843.59 × 13,457.98
4. Step 4: Simplify right side
   20,909.98x = 388,176,457.35
5. Step 5: Solve for x
   x = 388,176,457.35/20,909.98
6. Step 6: Final answer
   x = 18,564.17