Finding the Fourth Proportional to 127.79, 191.69 and 42.29

Step by Step Solution

1. Step 1: Write the proportion equation
   127.79 : 191.69 = 42.29 : x
2. Step 2: Convert to fraction form
   127.79/191.69 = 42.29/x
3. Step 3: Cross multiply
   127.79x = 191.69 × 42.29
4. Step 4: Simplify right side
   127.79x = 8,105.40
5. Step 5: Solve for x
   x = 8,105.40/127.79
6. Step 6: Final answer
   x = 63.43