Finding the Fourth Proportional to 11,085.78, 16,610.97 and 7,760.34

Step by Step Solution

1. Step 1: Write the proportion equation
   11,085.78 : 16,610.97 = 7,760.34 : x
2. Step 2: Convert to fraction form
   11,085.78/16,610.97 = 7,760.34/x
3. Step 3: Cross multiply
   11,085.78x = 16,610.97 × 7,760.34
4. Step 4: Simplify right side
   11,085.78x = 128,906,774.93
5. Step 5: Solve for x
   x = 128,906,774.93/11,085.78
6. Step 6: Final answer
   x = 11,628.12