Finding the Fourth Proportional to 2,075.05, 3,112.16 and 688.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,075.05 : 3,112.16 = 688.13 : x
2. Step 2: Convert to fraction form
   2,075.05/3,112.16 = 688.13/x
3. Step 3: Cross multiply
   2,075.05x = 3,112.16 × 688.13
4. Step 4: Simplify right side
   2,075.05x = 2,141,563.33
5. Step 5: Solve for x
   x = 2,141,563.33/2,075.05
6. Step 6: Final answer
   x = 1,032.05