Finding the Fourth Proportional to 11,456.78, 17,187.86 and 3,665.66

Step by Step Solution

1. Step 1: Write the proportion equation
   11,456.78 : 17,187.86 = 3,665.66 : x
2. Step 2: Convert to fraction form
   11,456.78/17,187.86 = 3,665.66/x
3. Step 3: Cross multiply
   11,456.78x = 17,187.86 × 3,665.66
4. Step 4: Simplify right side
   11,456.78x = 63,004,774.11
5. Step 5: Solve for x
   x = 63,004,774.11/11,456.78
6. Step 6: Final answer
   x = 5,499.35