Finding the Fourth Proportional to 1,227,300.38, 1,840,906.84 and 428,578.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227,300.38 : 1,840,906.84 = 428,578.82 : x
2. Step 2: Convert to fraction form
   1,227,300.38/1,840,906.84 = 428,578.82/x
3. Step 3: Cross multiply
   1,227,300.38x = 1,840,906.84 × 428,578.82
4. Step 4: Simplify right side
   1,227,300.38x = 788,973,681,217.13
5. Step 5: Solve for x
   x = 788,973,681,217.13/1,227,300.38
6. Step 6: Final answer
   x = 642,852.96