Finding the Fourth Proportional to 78.99, 118.18 and 59.79

Step by Step Solution

1. Step 1: Write the proportion equation
   78.99 : 118.18 = 59.79 : x
2. Step 2: Convert to fraction form
   78.99/118.18 = 59.79/x
3. Step 3: Cross multiply
   78.99x = 118.18 × 59.79
4. Step 4: Simplify right side
   78.99x = 7,065.50
5. Step 5: Solve for x
   x = 7,065.50/78.99
6. Step 6: Final answer
   x = 89.45