Finding the Fourth Proportional to 1,247.82, 1,722.06 and 806.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,247.82 : 1,722.06 = 806.10 : x
2. Step 2: Convert to fraction form
   1,247.82/1,722.06 = 806.10/x
3. Step 3: Cross multiply
   1,247.82x = 1,722.06 × 806.10
4. Step 4: Simplify right side
   1,247.82x = 1,388,152.57
5. Step 5: Solve for x
   x = 1,388,152.57/1,247.82
6. Step 6: Final answer
   x = 1,112.46