Finding the Fourth Proportional to 640,636.05, 884,081.76 and 350,248.28

Step by Step Solution

1. Step 1: Write the proportion equation
   640,636.05 : 884,081.76 = 350,248.28 : x
2. Step 2: Convert to fraction form
   640,636.05/884,081.76 = 350,248.28/x
3. Step 3: Cross multiply
   640,636.05x = 884,081.76 × 350,248.28
4. Step 4: Simplify right side
   640,636.05x = 309,648,109,647.72
5. Step 5: Solve for x
   x = 309,648,109,647.72/640,636.05
6. Step 6: Final answer
   x = 483,344.81