Finding the Fourth Proportional to 2,075.08, 3,113.15 and 688.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,075.08 : 3,113.15 = 688.80 : x
2. Step 2: Convert to fraction form
   2,075.08/3,113.15 = 688.80/x
3. Step 3: Cross multiply
   2,075.08x = 3,113.15 × 688.80
4. Step 4: Simplify right side
   2,075.08x = 2,144,337.72
5. Step 5: Solve for x
   x = 2,144,337.72/2,075.08
6. Step 6: Final answer
   x = 1,033.38