Finding the Fourth Proportional to 2,074.93, 3,111.21 and 688.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.93 : 3,111.21 = 688.16 : x
2. Step 2: Convert to fraction form
   2,074.93/3,111.21 = 688.16/x
3. Step 3: Cross multiply
   2,074.93x = 3,111.21 × 688.16
4. Step 4: Simplify right side
   2,074.93x = 2,141,018.05
5. Step 5: Solve for x
   x = 2,141,018.05/2,074.93
6. Step 6: Final answer
   x = 1,031.85