Finding the Fourth Proportional to 105.50, 157.89 and 99.58

Step by Step Solution

1. Step 1: Write the proportion equation
   105.50 : 157.89 = 99.58 : x
2. Step 2: Convert to fraction form
   105.50/157.89 = 99.58/x
3. Step 3: Cross multiply
   105.50x = 157.89 × 99.58
4. Step 4: Simplify right side
   105.50x = 15,722.69
5. Step 5: Solve for x
   x = 15,722.69/105.50
6. Step 6: Final answer
   x = 149.03