Finding the Fourth Proportional to 1,378,300.89, 2,067,450.12 and 431,745.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378,300.89 : 2,067,450.12 = 431,745.42 : x
2. Step 2: Convert to fraction form
   1,378,300.89/2,067,450.12 = 431,745.42/x
3. Step 3: Cross multiply
   1,378,300.89x = 2,067,450.12 × 431,745.42
4. Step 4: Simplify right side
   1,378,300.89x = 892,612,120,388.45
5. Step 5: Solve for x
   x = 892,612,120,388.45/1,378,300.89
6. Step 6: Final answer
   x = 647,617.75