Finding the Fourth Proportional to 402,104.45, 555,028.71 and 258,864.50

Step by Step Solution

1. Step 1: Write the proportion equation
   402,104.45 : 555,028.71 = 258,864.50 : x
2. Step 2: Convert to fraction form
   402,104.45/555,028.71 = 258,864.50/x
3. Step 3: Cross multiply
   402,104.45x = 555,028.71 × 258,864.50
4. Step 4: Simplify right side
   402,104.45x = 143,677,229,499.80
5. Step 5: Solve for x
   x = 143,677,229,499.80/402,104.45
6. Step 6: Final answer
   x = 357,313.20