Finding the Fourth Proportional to 1,222,300.20, 1,686,748.14 and 678,404.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,300.20 : 1,686,748.14 = 678,404.28 : x
2. Step 2: Convert to fraction form
   1,222,300.20/1,686,748.14 = 678,404.28/x
3. Step 3: Cross multiply
   1,222,300.20x = 1,686,748.14 × 678,404.28
4. Step 4: Simplify right side
   1,222,300.20x = 1,144,297,157,458.04
5. Step 5: Solve for x
   x = 1,144,297,157,458.04/1,222,300.20
6. Step 6: Final answer
   x = 936,183.40