Finding the Fourth Proportional to 1,075.74, 1,610.56 and 728.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,075.74 : 1,610.56 = 728.25 : x
2. Step 2: Convert to fraction form
   1,075.74/1,610.56 = 728.25/x
3. Step 3: Cross multiply
   1,075.74x = 1,610.56 × 728.25
4. Step 4: Simplify right side
   1,075.74x = 1,172,890.32
5. Step 5: Solve for x
   x = 1,172,890.32/1,075.74
6. Step 6: Final answer
   x = 1,090.31