Finding the Fourth Proportional to 404,398.72, 606,106.14 and 286,104.16

Step by Step Solution

1. Step 1: Write the proportion equation
   404,398.72 : 606,106.14 = 286,104.16 : x
2. Step 2: Convert to fraction form
   404,398.72/606,106.14 = 286,104.16/x
3. Step 3: Cross multiply
   404,398.72x = 606,106.14 × 286,104.16
4. Step 4: Simplify right side
   404,398.72x = 173,409,488,055.54
5. Step 5: Solve for x
   x = 173,409,488,055.54/404,398.72
6. Step 6: Final answer
   x = 428,808.20