Finding the Fourth Proportional to 12,086.06, 16,640.85 and 10,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,086.06 : 16,640.85 = 10,978.88 : x
2. Step 2: Convert to fraction form
   12,086.06/16,640.85 = 10,978.88/x
3. Step 3: Cross multiply
   12,086.06x = 16,640.85 × 10,978.88
4. Step 4: Simplify right side
   12,086.06x = 182,697,895.25
5. Step 5: Solve for x
   x = 182,697,895.25/12,086.06
6. Step 6: Final answer
   x = 15,116.41