Finding the Fourth Proportional to 78.69, 108.46 and 59.02

Step by Step Solution

1. Step 1: Write the proportion equation
   78.69 : 108.46 = 59.02 : x
2. Step 2: Convert to fraction form
   78.69/108.46 = 59.02/x
3. Step 3: Cross multiply
   78.69x = 108.46 × 59.02
4. Step 4: Simplify right side
   78.69x = 6,401.31
5. Step 5: Solve for x
   x = 6,401.31/78.69
6. Step 6: Final answer
   x = 81.35