Finding the Fourth Proportional to 2,106, 3,156.15 and 806.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106 : 3,156.15 = 806.76 : x
2. Step 2: Convert to fraction form
   2,106/3,156.15 = 806.76/x
3. Step 3: Cross multiply
   2,106x = 3,156.15 × 806.76
4. Step 4: Simplify right side
   2,106x = 2,546,255.57
5. Step 5: Solve for x
   x = 2,546,255.57/2,106
6. Step 6: Final answer
   x = 1,209.05