Finding the Fourth Proportional to 329,443.28, 489,926.72 and 318,945.68

Step by Step Solution

1. Step 1: Write the proportion equation
   329,443.28 : 489,926.72 = 318,945.68 : x
2. Step 2: Convert to fraction form
   329,443.28/489,926.72 = 318,945.68/x
3. Step 3: Cross multiply
   329,443.28x = 489,926.72 × 318,945.68
4. Step 4: Simplify right side
   329,443.28x = 156,260,010,860.57
5. Step 5: Solve for x
   x = 156,260,010,860.57/329,443.28
6. Step 6: Final answer
   x = 474,315.37