Finding the Fourth Proportional to 2,075.34, 3,112.94 and 688.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,075.34 : 3,112.94 = 688.10 : x
2. Step 2: Convert to fraction form
   2,075.34/3,112.94 = 688.10/x
3. Step 3: Cross multiply
   2,075.34x = 3,112.94 × 688.10
4. Step 4: Simplify right side
   2,075.34x = 2,142,023.52
5. Step 5: Solve for x
   x = 2,142,023.52/2,075.34
6. Step 6: Final answer
   x = 1,032.13