Finding the Fourth Proportional to 127.69, 191.59 and 42.19

Step by Step Solution

1. Step 1: Write the proportion equation
   127.69 : 191.59 = 42.19 : x
2. Step 2: Convert to fraction form
   127.69/191.59 = 42.19/x
3. Step 3: Cross multiply
   127.69x = 191.59 × 42.19
4. Step 4: Simplify right side
   127.69x = 8,082.60
5. Step 5: Solve for x
   x = 8,082.60/127.69
6. Step 6: Final answer
   x = 63.30