Finding the Fourth Proportional to 1,222,185.34, 1,686,590.38 and 678,289.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,185.34 : 1,686,590.38 = 678,289.54 : x
2. Step 2: Convert to fraction form
   1,222,185.34/1,686,590.38 = 678,289.54/x
3. Step 3: Cross multiply
   1,222,185.34x = 1,686,590.38 × 678,289.54
4. Step 4: Simplify right side
   1,222,185.34x = 1,143,996,613,018.63
5. Step 5: Solve for x
   x = 1,143,996,613,018.63/1,222,185.34
6. Step 6: Final answer
   x = 936,025.47