Finding the Fourth Proportional to 663,498.72, 915,672.24 and 377,019.36

Step by Step Solution

1. Step 1: Write the proportion equation
   663,498.72 : 915,672.24 = 377,019.36 : x
2. Step 2: Convert to fraction form
   663,498.72/915,672.24 = 377,019.36/x
3. Step 3: Cross multiply
   663,498.72x = 915,672.24 × 377,019.36
4. Step 4: Simplify right side
   663,498.72x = 345,226,161,894.57
5. Step 5: Solve for x
   x = 345,226,161,894.57/663,498.72
6. Step 6: Final answer
   x = 520,311.72