Finding the Fourth Proportional to 2,740.88, 4,111.34 and 688.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,740.88 : 4,111.34 = 688.88 : x
2. Step 2: Convert to fraction form
   2,740.88/4,111.34 = 688.88/x
3. Step 3: Cross multiply
   2,740.88x = 4,111.34 × 688.88
4. Step 4: Simplify right side
   2,740.88x = 2,832,219.90
5. Step 5: Solve for x
   x = 2,832,219.90/2,740.88
6. Step 6: Final answer
   x = 1,033.33