Finding the Fourth Proportional to 640,185.50, 883,491.42 and 353,699.43

Step by Step Solution

1. Step 1: Write the proportion equation
   640,185.50 : 883,491.42 = 353,699.43 : x
2. Step 2: Convert to fraction form
   640,185.50/883,491.42 = 353,699.43/x
3. Step 3: Cross multiply
   640,185.50x = 883,491.42 × 353,699.43
4. Step 4: Simplify right side
   640,185.50x = 312,490,411,663.89
5. Step 5: Solve for x
   x = 312,490,411,663.89/640,185.50
6. Step 6: Final answer
   x = 488,124.79