Finding the Fourth Proportional to 2,066.16, 3,099.34 and 678.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,066.16 : 3,099.34 = 678.94 : x
2. Step 2: Convert to fraction form
   2,066.16/3,099.34 = 678.94/x
3. Step 3: Cross multiply
   2,066.16x = 3,099.34 × 678.94
4. Step 4: Simplify right side
   2,066.16x = 2,104,265.90
5. Step 5: Solve for x
   x = 2,104,265.90/2,066.16
6. Step 6: Final answer
   x = 1,018.44