Finding the Fourth Proportional to 298.89, 445.50 and 287.82

Step by Step Solution

1. Step 1: Write the proportion equation
   298.89 : 445.50 = 287.82 : x
2. Step 2: Convert to fraction form
   298.89/445.50 = 287.82/x
3. Step 3: Cross multiply
   298.89x = 445.50 × 287.82
4. Step 4: Simplify right side
   298.89x = 128,223.81
5. Step 5: Solve for x
   x = 128,223.81/298.89
6. Step 6: Final answer
   x = 429