Finding the Fourth Proportional to 2,074.69, 3,112.94 and 688.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.69 : 3,112.94 = 688.21 : x
2. Step 2: Convert to fraction form
   2,074.69/3,112.94 = 688.21/x
3. Step 3: Cross multiply
   2,074.69x = 3,112.94 × 688.21
4. Step 4: Simplify right side
   2,074.69x = 2,142,356.44
5. Step 5: Solve for x
   x = 2,142,356.44/2,074.69
6. Step 6: Final answer
   x = 1,032.62