Finding the Fourth Proportional to 411,648.72, 617,454.52 and 171,663.80

Step by Step Solution

1. Step 1: Write the proportion equation
   411,648.72 : 617,454.52 = 171,663.80 : x
2. Step 2: Convert to fraction form
   411,648.72/617,454.52 = 171,663.80/x
3. Step 3: Cross multiply
   411,648.72x = 617,454.52 × 171,663.80
4. Step 4: Simplify right side
   411,648.72x = 105,994,589,230.38
5. Step 5: Solve for x
   x = 105,994,589,230.38/411,648.72
6. Step 6: Final answer
   x = 257,487.96