Finding the Fourth Proportional to 20,523.72, 28,303.82 and 12,956.96

Step by Step Solution

1. Step 1: Write the proportion equation
   20,523.72 : 28,303.82 = 12,956.96 : x
2. Step 2: Convert to fraction form
   20,523.72/28,303.82 = 12,956.96/x
3. Step 3: Cross multiply
   20,523.72x = 28,303.82 × 12,956.96
4. Step 4: Simplify right side
   20,523.72x = 366,731,463.59
5. Step 5: Solve for x
   x = 366,731,463.59/20,523.72
6. Step 6: Final answer
   x = 17,868.66