Finding the Fourth Proportional to 2,075.27, 3,112.74 and 688.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,075.27 : 3,112.74 = 688.15 : x
2. Step 2: Convert to fraction form
   2,075.27/3,112.74 = 688.15/x
3. Step 3: Cross multiply
   2,075.27x = 3,112.74 × 688.15
4. Step 4: Simplify right side
   2,075.27x = 2,142,032.03
5. Step 5: Solve for x
   x = 2,142,032.03/2,075.27
6. Step 6: Final answer
   x = 1,032.17