Finding the Fourth Proportional to 1,096.21, 1,644.47 and 402.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,096.21 : 1,644.47 = 402.72 : x
2. Step 2: Convert to fraction form
   1,096.21/1,644.47 = 402.72/x
3. Step 3: Cross multiply
   1,096.21x = 1,644.47 × 402.72
4. Step 4: Simplify right side
   1,096.21x = 662,250.72
5. Step 5: Solve for x
   x = 662,250.72/1,096.21
6. Step 6: Final answer
   x = 604.13