Finding the Fourth Proportional to 11,978.51, 17,968.98 and 4,589.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.51 : 17,968.98 = 4,589.15 : x
2. Step 2: Convert to fraction form
   11,978.51/17,968.98 = 4,589.15/x
3. Step 3: Cross multiply
   11,978.51x = 17,968.98 × 4,589.15
4. Step 4: Simplify right side
   11,978.51x = 82,462,344.57
5. Step 5: Solve for x
   x = 82,462,344.57/11,978.51
6. Step 6: Final answer
   x = 6,884.19