Finding the Fourth Proportional to 105.60, 158.30 and 59.99

Step by Step Solution

1. Step 1: Write the proportion equation
   105.60 : 158.30 = 59.99 : x
2. Step 2: Convert to fraction form
   105.60/158.30 = 59.99/x
3. Step 3: Cross multiply
   105.60x = 158.30 × 59.99
4. Step 4: Simplify right side
   105.60x = 9,496.78
5. Step 5: Solve for x
   x = 9,496.78/105.60
6. Step 6: Final answer
   x = 89.93