Finding the Fourth Proportional to 146.34, 219.59 and 139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   146.34 : 219.59 = 139.50 : x
2. Step 2: Convert to fraction form
   146.34/219.59 = 139.50/x
3. Step 3: Cross multiply
   146.34x = 219.59 × 139.50
4. Step 4: Simplify right side
   146.34x = 30,632.81
5. Step 5: Solve for x
   x = 30,632.81/146.34
6. Step 6: Final answer
   x = 209.33