Finding the Fourth Proportional to 2,075.59, 3,112.98 and 688.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,075.59 : 3,112.98 = 688.69 : x
2. Step 2: Convert to fraction form
   2,075.59/3,112.98 = 688.69/x
3. Step 3: Cross multiply
   2,075.59x = 3,112.98 × 688.69
4. Step 4: Simplify right side
   2,075.59x = 2,143,878.20
5. Step 5: Solve for x
   x = 2,143,878.20/2,075.59
6. Step 6: Final answer
   x = 1,032.90