Finding the Fourth Proportional to 111.29, 166.95 and 59.99

Step by Step Solution

1. Step 1: Write the proportion equation
   111.29 : 166.95 = 59.99 : x
2. Step 2: Convert to fraction form
   111.29/166.95 = 59.99/x
3. Step 3: Cross multiply
   111.29x = 166.95 × 59.99
4. Step 4: Simplify right side
   111.29x = 10,014.50
5. Step 5: Solve for x
   x = 10,014.50/111.29
6. Step 6: Final answer
   x = 89.99