Finding the Fourth Proportional to 11,006.78, 16,509 and 3,109.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,006.78 : 16,509 = 3,109.10 : x
2. Step 2: Convert to fraction form
   11,006.78/16,509 = 3,109.10/x
3. Step 3: Cross multiply
   11,006.78x = 16,509 × 3,109.10
4. Step 4: Simplify right side
   11,006.78x = 51,328,131.90
5. Step 5: Solve for x
   x = 51,328,131.90/11,006.78
6. Step 6: Final answer
   x = 4,663.32