Finding the Fourth Proportional to 404,315.34, 605,981.06 and 286,020.78

Step by Step Solution

1. Step 1: Write the proportion equation
   404,315.34 : 605,981.06 = 286,020.78 : x
2. Step 2: Convert to fraction form
   404,315.34/605,981.06 = 286,020.78/x
3. Step 3: Cross multiply
   404,315.34x = 605,981.06 × 286,020.78
4. Step 4: Simplify right side
   404,315.34x = 173,323,175,446.43
5. Step 5: Solve for x
   x = 173,323,175,446.43/404,315.34
6. Step 6: Final answer
   x = 428,683.15