Finding the Fourth Proportional to 105.99, 146.30 and 91.59

Step by Step Solution

1. Step 1: Write the proportion equation
   105.99 : 146.30 = 91.59 : x
2. Step 2: Convert to fraction form
   105.99/146.30 = 91.59/x
3. Step 3: Cross multiply
   105.99x = 146.30 × 91.59
4. Step 4: Simplify right side
   105.99x = 13,399.62
5. Step 5: Solve for x
   x = 13,399.62/105.99
6. Step 6: Final answer
   x = 126.42