Finding the Fourth Proportional to 1,485,128.25, 2,227,335.57 and 685,641.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485,128.25 : 2,227,335.57 = 685,641.69 : x
2. Step 2: Convert to fraction form
   1,485,128.25/2,227,335.57 = 685,641.69/x
3. Step 3: Cross multiply
   1,485,128.25x = 2,227,335.57 × 685,641.69
4. Step 4: Simplify right side
   1,485,128.25x = 1,527,154,124,411.91
5. Step 5: Solve for x
   x = 1,527,154,124,411.91/1,485,128.25
6. Step 6: Final answer
   x = 1,028,297.81