Finding the Fourth Proportional to 1,079,578.18, 1,619,595.61 and 405,665.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079,578.18 : 1,619,595.61 = 405,665.31 : x
2. Step 2: Convert to fraction form
   1,079,578.18/1,619,595.61 = 405,665.31/x
3. Step 3: Cross multiply
   1,079,578.18x = 1,619,595.61 × 405,665.31
4. Step 4: Simplify right side
   1,079,578.18x = 657,013,760,264.61
5. Step 5: Solve for x
   x = 657,013,760,264.61/1,079,578.18
6. Step 6: Final answer
   x = 608,583.77