Finding the Fourth Proportional to 431,443.48, 647,223.54 and 405,199.48

Step by Step Solution

1. Step 1: Write the proportion equation
   431,443.48 : 647,223.54 = 405,199.48 : x
2. Step 2: Convert to fraction form
   431,443.48/647,223.54 = 405,199.48/x
3. Step 3: Cross multiply
   431,443.48x = 647,223.54 × 405,199.48
4. Step 4: Simplify right side
   431,443.48x = 262,254,641,851.76
5. Step 5: Solve for x
   x = 262,254,641,851.76/431,443.48
6. Step 6: Final answer
   x = 607,853.99