Finding the Fourth Proportional to 257,665.38, 355,581.89 and 155,676.66

Step by Step Solution

1. Step 1: Write the proportion equation
   257,665.38 : 355,581.89 = 155,676.66 : x
2. Step 2: Convert to fraction form
   257,665.38/355,581.89 = 155,676.66/x
3. Step 3: Cross multiply
   257,665.38x = 355,581.89 × 155,676.66
4. Step 4: Simplify right side
   257,665.38x = 55,355,800,991.69
5. Step 5: Solve for x
   x = 55,355,800,991.69/257,665.38
6. Step 6: Final answer
   x = 214,836.01