Finding the Fourth Proportional to 2,074.76, 3,112.62 and 688.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.76 : 3,112.62 = 688.28 : x
2. Step 2: Convert to fraction form
   2,074.76/3,112.62 = 688.28/x
3. Step 3: Cross multiply
   2,074.76x = 3,112.62 × 688.28
4. Step 4: Simplify right side
   2,074.76x = 2,142,354.09
5. Step 5: Solve for x
   x = 2,142,354.09/2,074.76
6. Step 6: Final answer
   x = 1,032.58