Finding the Fourth Proportional to 85,978.67, 118,708.38 and 65,799.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,978.67 : 118,708.38 = 65,799.50 : x
2. Step 2: Convert to fraction form
   85,978.67/118,708.38 = 65,799.50/x
3. Step 3: Cross multiply
   85,978.67x = 118,708.38 × 65,799.50
4. Step 4: Simplify right side
   85,978.67x = 7,810,951,456.27
5. Step 5: Solve for x
   x = 7,810,951,456.27/85,978.67
6. Step 6: Final answer
   x = 90,847.55