Finding the Fourth Proportional to 11,978.76, 17,968.94 and 4,078.02

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.76 : 17,968.94 = 4,078.02 : x
2. Step 2: Convert to fraction form
   11,978.76/17,968.94 = 4,078.02/x
3. Step 3: Cross multiply
   11,978.76x = 17,968.94 × 4,078.02
4. Step 4: Simplify right side
   11,978.76x = 73,277,696.70
5. Step 5: Solve for x
   x = 73,277,696.70/11,978.76
6. Step 6: Final answer
   x = 6,117.30