Finding the Fourth Proportional to 162.78, 224.50 and 100.56

Step by Step Solution

1. Step 1: Write the proportion equation
   162.78 : 224.50 = 100.56 : x
2. Step 2: Convert to fraction form
   162.78/224.50 = 100.56/x
3. Step 3: Cross multiply
   162.78x = 224.50 × 100.56
4. Step 4: Simplify right side
   162.78x = 22,575.72
5. Step 5: Solve for x
   x = 22,575.72/162.78
6. Step 6: Final answer
   x = 138.69