Finding the Fourth Proportional to 456,039.72, 684,061.20 and 268,920

Step by Step Solution

1. Step 1: Write the proportion equation
   456,039.72 : 684,061.20 = 268,920 : x
2. Step 2: Convert to fraction form
   456,039.72/684,061.20 = 268,920/x
3. Step 3: Cross multiply
   456,039.72x = 684,061.20 × 268,920
4. Step 4: Simplify right side
   456,039.72x = 183,957,737,904
5. Step 5: Solve for x
   x = 183,957,737,904/456,039.72
6. Step 6: Final answer
   x = 403,380.96