Finding the Fourth Proportional to 402,300.79, 555,175.33 and 221,024.41

Step by Step Solution

1. Step 1: Write the proportion equation
   402,300.79 : 555,175.33 = 221,024.41 : x
2. Step 2: Convert to fraction form
   402,300.79/555,175.33 = 221,024.41/x
3. Step 3: Cross multiply
   402,300.79x = 555,175.33 × 221,024.41
4. Step 4: Simplify right side
   402,300.79x = 122,707,297,819.31
5. Step 5: Solve for x
   x = 122,707,297,819.31/402,300.79
6. Step 6: Final answer
   x = 305,013.81