Finding the Fourth Proportional to 907,839.50, 1,361,365.38 and 308,639.72

Step by Step Solution

1. Step 1: Write the proportion equation
   907,839.50 : 1,361,365.38 = 308,639.72 : x
2. Step 2: Convert to fraction form
   907,839.50/1,361,365.38 = 308,639.72/x
3. Step 3: Cross multiply
   907,839.50x = 1,361,365.38 × 308,639.72
4. Step 4: Simplify right side
   907,839.50x = 420,171,429,700.89
5. Step 5: Solve for x
   x = 420,171,429,700.89/907,839.50
6. Step 6: Final answer
   x = 462,825.68