Finding the Fourth Proportional to 10,774.43, 16,146.90 and 8,139.77

Step by Step Solution

1. Step 1: Write the proportion equation
   10,774.43 : 16,146.90 = 8,139.77 : x
2. Step 2: Convert to fraction form
   10,774.43/16,146.90 = 8,139.77/x
3. Step 3: Cross multiply
   10,774.43x = 16,146.90 × 8,139.77
4. Step 4: Simplify right side
   10,774.43x = 131,432,052.21
5. Step 5: Solve for x
   x = 131,432,052.21/10,774.43
6. Step 6: Final answer
   x = 12,198.52