Finding the Fourth Proportional to 631,627.28, 871,647.91 and 345,147.37

Step by Step Solution

1. Step 1: Write the proportion equation
   631,627.28 : 871,647.91 = 345,147.37 : x
2. Step 2: Convert to fraction form
   631,627.28/871,647.91 = 345,147.37/x
3. Step 3: Cross multiply
   631,627.28x = 871,647.91 × 345,147.37
4. Step 4: Simplify right side
   631,627.28x = 300,846,983,087.33
5. Step 5: Solve for x
   x = 300,846,983,087.33/631,627.28
6. Step 6: Final answer
   x = 476,304.61