Finding the Fourth Proportional to 100.78, 151.14 and 49.42

Step by Step Solution

1. Step 1: Write the proportion equation
   100.78 : 151.14 = 49.42 : x
2. Step 2: Convert to fraction form
   100.78/151.14 = 49.42/x
3. Step 3: Cross multiply
   100.78x = 151.14 × 49.42
4. Step 4: Simplify right side
   100.78x = 7,469.34
5. Step 5: Solve for x
   x = 7,469.34/100.78
6. Step 6: Final answer
   x = 74.12