Finding the Fourth Proportional to 465,644.10, 642,642.15 and 258,933.15

Step by Step Solution

1. Step 1: Write the proportion equation
   465,644.10 : 642,642.15 = 258,933.15 : x
2. Step 2: Convert to fraction form
   465,644.10/642,642.15 = 258,933.15/x
3. Step 3: Cross multiply
   465,644.10x = 642,642.15 × 258,933.15
4. Step 4: Simplify right side
   465,644.10x = 166,401,356,222.27
5. Step 5: Solve for x
   x = 166,401,356,222.27/465,644.10
6. Step 6: Final answer
   x = 357,357.38