Finding the Fourth Proportional to 158.78, 219.06 and 100.52

Step by Step Solution

1. Step 1: Write the proportion equation
   158.78 : 219.06 = 100.52 : x
2. Step 2: Convert to fraction form
   158.78/219.06 = 100.52/x
3. Step 3: Cross multiply
   158.78x = 219.06 × 100.52
4. Step 4: Simplify right side
   158.78x = 22,019.91
5. Step 5: Solve for x
   x = 22,019.91/158.78
6. Step 6: Final answer
   x = 138.68