Finding the Fourth Proportional to 127.78, 176.36 and 72.52

Step by Step Solution

1. Step 1: Write the proportion equation
   127.78 : 176.36 = 72.52 : x
2. Step 2: Convert to fraction form
   127.78/176.36 = 72.52/x
3. Step 3: Cross multiply
   127.78x = 176.36 × 72.52
4. Step 4: Simplify right side
   127.78x = 12,788.82
5. Step 5: Solve for x
   x = 12,788.82/127.78
6. Step 6: Final answer
   x = 100.09