Finding the Fourth Proportional to 1,395.80, 1,926.06 and 806.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.80 : 1,926.06 = 806.30 : x
2. Step 2: Convert to fraction form
   1,395.80/1,926.06 = 806.30/x
3. Step 3: Cross multiply
   1,395.80x = 1,926.06 × 806.30
4. Step 4: Simplify right side
   1,395.80x = 1,552,972.55
5. Step 5: Solve for x
   x = 1,552,972.55/1,395.80
6. Step 6: Final answer
   x = 1,112.61