Finding the Fourth Proportional to 2,074.84, 3,111.94 and 688.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.84 : 3,111.94 = 688.20 : x
2. Step 2: Convert to fraction form
   2,074.84/3,111.94 = 688.20/x
3. Step 3: Cross multiply
   2,074.84x = 3,111.94 × 688.20
4. Step 4: Simplify right side
   2,074.84x = 2,141,628.23
5. Step 5: Solve for x
   x = 2,141,628.23/2,074.84
6. Step 6: Final answer
   x = 1,032.19