Finding the Fourth Proportional to 21,166.88, 31,722.82 and 8,672.74

Step by Step Solution

1. Step 1: Write the proportion equation
   21,166.88 : 31,722.82 = 8,672.74 : x
2. Step 2: Convert to fraction form
   21,166.88/31,722.82 = 8,672.74/x
3. Step 3: Cross multiply
   21,166.88x = 31,722.82 × 8,672.74
4. Step 4: Simplify right side
   21,166.88x = 275,123,769.93
5. Step 5: Solve for x
   x = 275,123,769.93/21,166.88
6. Step 6: Final answer
   x = 12,997.84