Finding the Fourth Proportional to 1,222,764.48, 1,687,467.69 and 678,900.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,764.48 : 1,687,467.69 = 678,900.30 : x
2. Step 2: Convert to fraction form
   1,222,764.48/1,687,467.69 = 678,900.30/x
3. Step 3: Cross multiply
   1,222,764.48x = 1,687,467.69 × 678,900.30
4. Step 4: Simplify right side
   1,222,764.48x = 1,145,622,320,981.31
5. Step 5: Solve for x
   x = 1,145,622,320,981.31/1,222,764.48
6. Step 6: Final answer
   x = 936,911.68