Finding the Fourth Proportional to 78.25, 107.98 and 59.91

Step by Step Solution

1. Step 1: Write the proportion equation
   78.25 : 107.98 = 59.91 : x
2. Step 2: Convert to fraction form
   78.25/107.98 = 59.91/x
3. Step 3: Cross multiply
   78.25x = 107.98 × 59.91
4. Step 4: Simplify right side
   78.25x = 6,469.78
5. Step 5: Solve for x
   x = 6,469.78/78.25
6. Step 6: Final answer
   x = 82.68