Finding the Fourth Proportional to 404,402.72, 606,112.12 and 286,108.16

Step by Step Solution

1. Step 1: Write the proportion equation
   404,402.72 : 606,112.12 = 286,108.16 : x
2. Step 2: Convert to fraction form
   404,402.72/606,112.12 = 286,108.16/x
3. Step 3: Cross multiply
   404,402.72x = 606,112.12 × 286,108.16
4. Step 4: Simplify right side
   404,402.72x = 173,413,623,406.90
5. Step 5: Solve for x
   x = 173,413,623,406.90/404,402.72
6. Step 6: Final answer
   x = 428,814.19