Finding the Fourth Proportional to 20,781.48, 31,160.70 and 8,300.52

Step by Step Solution

1. Step 1: Write the proportion equation
   20,781.48 : 31,160.70 = 8,300.52 : x
2. Step 2: Convert to fraction form
   20,781.48/31,160.70 = 8,300.52/x
3. Step 3: Cross multiply
   20,781.48x = 31,160.70 × 8,300.52
4. Step 4: Simplify right side
   20,781.48x = 258,650,013.56
5. Step 5: Solve for x
   x = 258,650,013.56/20,781.48
6. Step 6: Final answer
   x = 12,446.18