Finding the Fourth Proportional to 111.39, 166.98 and 59.99

Step by Step Solution

1. Step 1: Write the proportion equation
   111.39 : 166.98 = 59.99 : x
2. Step 2: Convert to fraction form
   111.39/166.98 = 59.99/x
3. Step 3: Cross multiply
   111.39x = 166.98 × 59.99
4. Step 4: Simplify right side
   111.39x = 10,016.30
5. Step 5: Solve for x
   x = 10,016.30/111.39
6. Step 6: Final answer
   x = 89.92