Finding the Fourth Proportional to 663,168.72, 915,174 and 361,362.72

Step by Step Solution

1. Step 1: Write the proportion equation
   663,168.72 : 915,174 = 361,362.72 : x
2. Step 2: Convert to fraction form
   663,168.72/915,174 = 361,362.72/x
3. Step 3: Cross multiply
   663,168.72x = 915,174 × 361,362.72
4. Step 4: Simplify right side
   663,168.72x = 330,709,765,913.28
5. Step 5: Solve for x
   x = 330,709,765,913.28/663,168.72
6. Step 6: Final answer
   x = 498,681.19