Finding the Fourth Proportional to 1,395.70, 1,926.09 and 806.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.70 : 1,926.09 = 806.42 : x
2. Step 2: Convert to fraction form
   1,395.70/1,926.09 = 806.42/x
3. Step 3: Cross multiply
   1,395.70x = 1,926.09 × 806.42
4. Step 4: Simplify right side
   1,395.70x = 1,553,242.31
5. Step 5: Solve for x
   x = 1,553,242.31/1,395.70
6. Step 6: Final answer
   x = 1,112.88