Finding the Fourth Proportional to 2,074.40, 3,112.22 and 688.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.40 : 3,112.22 = 688.12 : x
2. Step 2: Convert to fraction form
   2,074.40/3,112.22 = 688.12/x
3. Step 3: Cross multiply
   2,074.40x = 3,112.22 × 688.12
4. Step 4: Simplify right side
   2,074.40x = 2,141,580.83
5. Step 5: Solve for x
   x = 2,141,580.83/2,074.40
6. Step 6: Final answer
   x = 1,032.39