Finding the Fourth Proportional to 78,968.88, 108,906.51 and 65,518.83

Step by Step Solution

1. Step 1: Write the proportion equation
   78,968.88 : 108,906.51 = 65,518.83 : x
2. Step 2: Convert to fraction form
   78,968.88/108,906.51 = 65,518.83/x
3. Step 3: Cross multiply
   78,968.88x = 108,906.51 × 65,518.83
4. Step 4: Simplify right side
   78,968.88x = 7,135,427,114.58
5. Step 5: Solve for x
   x = 7,135,427,114.58/78,968.88
6. Step 6: Final answer
   x = 90,357.46