Finding the Fourth Proportional to 172.82, 238.28 and 139.98

Step by Step Solution

1. Step 1: Write the proportion equation
   172.82 : 238.28 = 139.98 : x
2. Step 2: Convert to fraction form
   172.82/238.28 = 139.98/x
3. Step 3: Cross multiply
   172.82x = 238.28 × 139.98
4. Step 4: Simplify right side
   172.82x = 33,354.43
5. Step 5: Solve for x
   x = 33,354.43/172.82
6. Step 6: Final answer
   x = 193.00