Finding the Fourth Proportional to 14,978.43, 20,672.15 and 8,690.67

Step by Step Solution

1. Step 1: Write the proportion equation
   14,978.43 : 20,672.15 = 8,690.67 : x
2. Step 2: Convert to fraction form
   14,978.43/20,672.15 = 8,690.67/x
3. Step 3: Cross multiply
   14,978.43x = 20,672.15 × 8,690.67
4. Step 4: Simplify right side
   14,978.43x = 179,654,790.39
5. Step 5: Solve for x
   x = 179,654,790.39/14,978.43
6. Step 6: Final answer
   x = 11,994.23