Finding the Fourth Proportional to 1,222,216.34, 1,686,737.37 and 678,352.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,216.34 : 1,686,737.37 = 678,352.16 : x
2. Step 2: Convert to fraction form
   1,222,216.34/1,686,737.37 = 678,352.16/x
3. Step 3: Cross multiply
   1,222,216.34x = 1,686,737.37 × 678,352.16
4. Step 4: Simplify right side
   1,222,216.34x = 1,144,201,929,377.30
5. Step 5: Solve for x
   x = 1,144,201,929,377.30/1,222,216.34
6. Step 6: Final answer
   x = 936,169.72