Finding the Fourth Proportional to 11,660.78, 17,487.38 and 3,867.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,660.78 : 17,487.38 = 3,867.50 : x
2. Step 2: Convert to fraction form
   11,660.78/17,487.38 = 3,867.50/x
3. Step 3: Cross multiply
   11,660.78x = 17,487.38 × 3,867.50
4. Step 4: Simplify right side
   11,660.78x = 67,632,442.15
5. Step 5: Solve for x
   x = 67,632,442.15/11,660.78
6. Step 6: Final answer
   x = 5,799.99