Finding the Fourth Proportional to 405,145.72, 607,389.72 and 168,665.41

Step by Step Solution

1. Step 1: Write the proportion equation
   405,145.72 : 607,389.72 = 168,665.41 : x
2. Step 2: Convert to fraction form
   405,145.72/607,389.72 = 168,665.41/x
3. Step 3: Cross multiply
   405,145.72x = 607,389.72 × 168,665.41
4. Step 4: Simplify right side
   405,145.72x = 102,445,636,153.59
5. Step 5: Solve for x
   x = 102,445,636,153.59/405,145.72
6. Step 6: Final answer
   x = 252,861.21