Finding the Fourth Proportional to 20,667.36, 28,522.71 and 11,716.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,667.36 : 28,522.71 = 11,716.50 : x
2. Step 2: Convert to fraction form
   20,667.36/28,522.71 = 11,716.50/x
3. Step 3: Cross multiply
   20,667.36x = 28,522.71 × 11,716.50
4. Step 4: Simplify right side
   20,667.36x = 334,186,331.72
5. Step 5: Solve for x
   x = 334,186,331.72/20,667.36
6. Step 6: Final answer
   x = 16,169.76