Finding the Fourth Proportional to 404,394.72, 606,100.14 and 286,100.16

Step by Step Solution

1. Step 1: Write the proportion equation
   404,394.72 : 606,100.14 = 286,100.16 : x
2. Step 2: Convert to fraction form
   404,394.72/606,100.14 = 286,100.16/x
3. Step 3: Cross multiply
   404,394.72x = 606,100.14 × 286,100.16
4. Step 4: Simplify right side
   404,394.72x = 173,405,347,030.02
5. Step 5: Solve for x
   x = 173,405,347,030.02/404,394.72
6. Step 6: Final answer
   x = 428,802.20