Finding the Fourth Proportional to 127.12, 191.06 and 105.59

Step by Step Solution

1. Step 1: Write the proportion equation
   127.12 : 191.06 = 105.59 : x
2. Step 2: Convert to fraction form
   127.12/191.06 = 105.59/x
3. Step 3: Cross multiply
   127.12x = 191.06 × 105.59
4. Step 4: Simplify right side
   127.12x = 20,173.50
5. Step 5: Solve for x
   x = 20,173.50/127.12
6. Step 6: Final answer
   x = 158.70