Finding the Fourth Proportional to 158.84, 219.15 and 100.61

Step by Step Solution

1. Step 1: Write the proportion equation
   158.84 : 219.15 = 100.61 : x
2. Step 2: Convert to fraction form
   158.84/219.15 = 100.61/x
3. Step 3: Cross multiply
   158.84x = 219.15 × 100.61
4. Step 4: Simplify right side
   158.84x = 22,047.59
5. Step 5: Solve for x
   x = 22,047.59/158.84
6. Step 6: Final answer
   x = 138.81