Finding the Fourth Proportional to 127.89, 192.18 and 67.07

Step by Step Solution

1. Step 1: Write the proportion equation
   127.89 : 192.18 = 67.07 : x
2. Step 2: Convert to fraction form
   127.89/192.18 = 67.07/x
3. Step 3: Cross multiply
   127.89x = 192.18 × 67.07
4. Step 4: Simplify right side
   127.89x = 12,889.03
5. Step 5: Solve for x
   x = 12,889.03/127.89
6. Step 6: Final answer
   x = 100.78