Finding the Fourth Proportional to 2,066.81, 3,100.10 and 679.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,066.81 : 3,100.10 = 679.95 : x
2. Step 2: Convert to fraction form
   2,066.81/3,100.10 = 679.95/x
3. Step 3: Cross multiply
   2,066.81x = 3,100.10 × 679.95
4. Step 4: Simplify right side
   2,066.81x = 2,107,909.60
5. Step 5: Solve for x
   x = 2,107,909.60/2,066.81
6. Step 6: Final answer
   x = 1,019.89