Finding the Fourth Proportional to 20,956.50, 28,902.69 and 12,567.06

Step by Step Solution

1. Step 1: Write the proportion equation
   20,956.50 : 28,902.69 = 12,567.06 : x
2. Step 2: Convert to fraction form
   20,956.50/28,902.69 = 12,567.06/x
3. Step 3: Cross multiply
   20,956.50x = 28,902.69 × 12,567.06
4. Step 4: Simplify right side
   20,956.50x = 363,221,839.39
5. Step 5: Solve for x
   x = 363,221,839.39/20,956.50
6. Step 6: Final answer
   x = 17,332.18