Finding the Fourth Proportional to 2,075.88, 3,112.76 and 688.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,075.88 : 3,112.76 = 688.72 : x
2. Step 2: Convert to fraction form
   2,075.88/3,112.76 = 688.72/x
3. Step 3: Cross multiply
   2,075.88x = 3,112.76 × 688.72
4. Step 4: Simplify right side
   2,075.88x = 2,143,820.07
5. Step 5: Solve for x
   x = 2,143,820.07/2,075.88
6. Step 6: Final answer
   x = 1,032.73