Finding the Fourth Proportional to 1,222,214.34, 1,686,630.42 and 678,318.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,214.34 : 1,686,630.42 = 678,318.24 : x
2. Step 2: Convert to fraction form
   1,222,214.34/1,686,630.42 = 678,318.24/x
3. Step 3: Cross multiply
   1,222,214.34x = 1,686,630.42 × 678,318.24
4. Step 4: Simplify right side
   1,222,214.34x = 1,144,072,178,024.86
5. Step 5: Solve for x
   x = 1,144,072,178,024.86/1,222,214.34
6. Step 6: Final answer
   x = 936,065.09