Finding the Fourth Proportional to 1,222,238.43, 1,686,656.61 and 678,360.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,238.43 : 1,686,656.61 = 678,360.18 : x
2. Step 2: Convert to fraction form
   1,222,238.43/1,686,656.61 = 678,360.18/x
3. Step 3: Cross multiply
   1,222,238.43x = 1,686,656.61 × 678,360.18
4. Step 4: Simplify right side
   1,222,238.43x = 1,144,160,681,557.79
5. Step 5: Solve for x
   x = 1,144,160,681,557.79/1,222,238.43
6. Step 6: Final answer
   x = 936,119.05