Finding the Fourth Proportional to 639,401.78, 882,381.78 and 352,922.09

Step by Step Solution

1. Step 1: Write the proportion equation
   639,401.78 : 882,381.78 = 352,922.09 : x
2. Step 2: Convert to fraction form
   639,401.78/882,381.78 = 352,922.09/x
3. Step 3: Cross multiply
   639,401.78x = 882,381.78 × 352,922.09
4. Step 4: Simplify right side
   639,401.78x = 311,412,021,975.52
5. Step 5: Solve for x
   x = 311,412,021,975.52/639,401.78
6. Step 6: Final answer
   x = 487,036.53