Finding the Fourth Proportional to 456,105.45, 684,269.54 and 321,432.21

Step by Step Solution

1. Step 1: Write the proportion equation
   456,105.45 : 684,269.54 = 321,432.21 : x
2. Step 2: Convert to fraction form
   456,105.45/684,269.54 = 321,432.21/x
3. Step 3: Cross multiply
   456,105.45x = 684,269.54 × 321,432.21
4. Step 4: Simplify right side
   456,105.45x = 219,946,268,870.72
5. Step 5: Solve for x
   x = 219,946,268,870.72/456,105.45
6. Step 6: Final answer
   x = 482,226.79