Finding the Fourth Proportional to 915.18, 1,372.83 and 298.72

Step by Step Solution

1. Step 1: Write the proportion equation
   915.18 : 1,372.83 = 298.72 : x
2. Step 2: Convert to fraction form
   915.18/1,372.83 = 298.72/x
3. Step 3: Cross multiply
   915.18x = 1,372.83 × 298.72
4. Step 4: Simplify right side
   915.18x = 410,091.78
5. Step 5: Solve for x
   x = 410,091.78/915.18
6. Step 6: Final answer
   x = 448.10