Finding the Fourth Proportional to 11,978.98, 17,969.15 and 3,660.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.98 : 17,969.15 = 3,660.28 : x
2. Step 2: Convert to fraction form
   11,978.98/17,969.15 = 3,660.28/x
3. Step 3: Cross multiply
   11,978.98x = 17,969.15 × 3,660.28
4. Step 4: Simplify right side
   11,978.98x = 65,772,102.06
5. Step 5: Solve for x
   x = 65,772,102.06/11,978.98
6. Step 6: Final answer
   x = 5,490.63