Finding the Fourth Proportional to 1,075.73, 1,616.30 and 685.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,075.73 : 1,616.30 = 685.91 : x
2. Step 2: Convert to fraction form
   1,075.73/1,616.30 = 685.91/x
3. Step 3: Cross multiply
   1,075.73x = 1,616.30 × 685.91
4. Step 4: Simplify right side
   1,075.73x = 1,108,642.09
5. Step 5: Solve for x
   x = 1,108,642.09/1,075.73
6. Step 6: Final answer
   x = 1,030.59