Finding the Fourth Proportional to 105.58, 158.37 and 59.91

Step by Step Solution

1. Step 1: Write the proportion equation
   105.58 : 158.37 = 59.91 : x
2. Step 2: Convert to fraction form
   105.58/158.37 = 59.91/x
3. Step 3: Cross multiply
   105.58x = 158.37 × 59.91
4. Step 4: Simplify right side
   105.58x = 9,487.95
5. Step 5: Solve for x
   x = 9,487.95/105.58
6. Step 6: Final answer
   x = 89.87