Finding the Fourth Proportional to 222.32, 306.69 and 139.52

Step by Step Solution

1. Step 1: Write the proportion equation
   222.32 : 306.69 = 139.52 : x
2. Step 2: Convert to fraction form
   222.32/306.69 = 139.52/x
3. Step 3: Cross multiply
   222.32x = 306.69 × 139.52
4. Step 4: Simplify right side
   222.32x = 42,789.39
5. Step 5: Solve for x
   x = 42,789.39/222.32
6. Step 6: Final answer
   x = 192.47