Finding the Fourth Proportional to 301.98, 452.72 and 139.54

Step by Step Solution

1. Step 1: Write the proportion equation
   301.98 : 452.72 = 139.54 : x
2. Step 2: Convert to fraction form
   301.98/452.72 = 139.54/x
3. Step 3: Cross multiply
   301.98x = 452.72 × 139.54
4. Step 4: Simplify right side
   301.98x = 63,172.55
5. Step 5: Solve for x
   x = 63,172.55/301.98
6. Step 6: Final answer
   x = 209.19