Finding the Fourth Proportional to 20,857.02, 31,284.72 and 8,373.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,857.02 : 31,284.72 = 8,373.30 : x
2. Step 2: Convert to fraction form
   20,857.02/31,284.72 = 8,373.30/x
3. Step 3: Cross multiply
   20,857.02x = 31,284.72 × 8,373.30
4. Step 4: Simplify right side
   20,857.02x = 261,956,345.98
5. Step 5: Solve for x
   x = 261,956,345.98/20,857.02
6. Step 6: Final answer
   x = 12,559.62