Finding the Fourth Proportional to 11,086.28, 16,611.72 and 7,760.84

Step by Step Solution

1. Step 1: Write the proportion equation
   11,086.28 : 16,611.72 = 7,760.84 : x
2. Step 2: Convert to fraction form
   11,086.28/16,611.72 = 7,760.84/x
3. Step 3: Cross multiply
   11,086.28x = 16,611.72 × 7,760.84
4. Step 4: Simplify right side
   11,086.28x = 128,920,901.04
5. Step 5: Solve for x
   x = 128,920,901.04/11,086.28
6. Step 6: Final answer
   x = 11,628.87