Finding the Fourth Proportional to 11,967.69, 17,951.51 and 3,647.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,967.69 : 17,951.51 = 3,647.78 : x
2. Step 2: Convert to fraction form
   11,967.69/17,951.51 = 3,647.78/x
3. Step 3: Cross multiply
   11,967.69x = 17,951.51 × 3,647.78
4. Step 4: Simplify right side
   11,967.69x = 65,483,069.39
5. Step 5: Solve for x
   x = 65,483,069.39/11,967.69
6. Step 6: Final answer
   x = 5,471.65