Finding the Fourth Proportional to 222.42, 306.86 and 139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   222.42 : 306.86 = 139.50 : x
2. Step 2: Convert to fraction form
   222.42/306.86 = 139.50/x
3. Step 3: Cross multiply
   222.42x = 306.86 × 139.50
4. Step 4: Simplify right side
   222.42x = 42,806.59
5. Step 5: Solve for x
   x = 42,806.59/222.42
6. Step 6: Final answer
   x = 192.46