Finding the Fourth Proportional to 804,936.10, 1,207,404.15 and 431,688.10

Step by Step Solution

1. Step 1: Write the proportion equation
   804,936.10 : 1,207,404.15 = 431,688.10 : x
2. Step 2: Convert to fraction form
   804,936.10/1,207,404.15 = 431,688.10/x
3. Step 3: Cross multiply
   804,936.10x = 1,207,404.15 × 431,688.10
4. Step 4: Simplify right side
   804,936.10x = 521,222,003,445.62
5. Step 5: Solve for x
   x = 521,222,003,445.62/804,936.10
6. Step 6: Final answer
   x = 647,532.15