Finding the Fourth Proportional to 367.89, 507.42 and 220.47

Step by Step Solution

1. Step 1: Write the proportion equation
   367.89 : 507.42 = 220.47 : x
2. Step 2: Convert to fraction form
   367.89/507.42 = 220.47/x
3. Step 3: Cross multiply
   367.89x = 507.42 × 220.47
4. Step 4: Simplify right side
   367.89x = 111,870.89
5. Step 5: Solve for x
   x = 111,870.89/367.89
6. Step 6: Final answer
   x = 304.09