Finding the Fourth Proportional to 308,958.28, 426,142.56 and 283,546.72

Step by Step Solution

1. Step 1: Write the proportion equation
   308,958.28 : 426,142.56 = 283,546.72 : x
2. Step 2: Convert to fraction form
   308,958.28/426,142.56 = 283,546.72/x
3. Step 3: Cross multiply
   308,958.28x = 426,142.56 × 283,546.72
4. Step 4: Simplify right side
   308,958.28x = 120,831,325,140.40
5. Step 5: Solve for x
   x = 120,831,325,140.40/308,958.28
6. Step 6: Final answer
   x = 391,092.69