Finding the Fourth Proportional to 1,222,560.78, 1,687,049.25 and 678,653.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,560.78 : 1,687,049.25 = 678,653.58 : x
2. Step 2: Convert to fraction form
   1,222,560.78/1,687,049.25 = 678,653.58/x
3. Step 3: Cross multiply
   1,222,560.78x = 1,687,049.25 × 678,653.58
4. Step 4: Simplify right side
   1,222,560.78x = 1,144,922,013,148.82
5. Step 5: Solve for x
   x = 1,144,922,013,148.82/1,222,560.78
6. Step 6: Final answer
   x = 936,494.96