Finding the Fourth Proportional to 639,411.31, 882,408.98 and 349,040.09

Step by Step Solution

1. Step 1: Write the proportion equation
   639,411.31 : 882,408.98 = 349,040.09 : x
2. Step 2: Convert to fraction form
   639,411.31/882,408.98 = 349,040.09/x
3. Step 3: Cross multiply
   639,411.31x = 882,408.98 × 349,040.09
4. Step 4: Simplify right side
   639,411.31x = 307,996,109,796.01
5. Step 5: Solve for x
   x = 307,996,109,796.01/639,411.31
6. Step 6: Final answer
   x = 481,686.99