Finding the Fourth Proportional to 20,937.72, 31,412.69 and 8,451.37

Step by Step Solution

1. Step 1: Write the proportion equation
   20,937.72 : 31,412.69 = 8,451.37 : x
2. Step 2: Convert to fraction form
   20,937.72/31,412.69 = 8,451.37/x
3. Step 3: Cross multiply
   20,937.72x = 31,412.69 × 8,451.37
4. Step 4: Simplify right side
   20,937.72x = 265,480,265.89
5. Step 5: Solve for x
   x = 265,480,265.89/20,937.72
6. Step 6: Final answer
   x = 12,679.52