Finding the Fourth Proportional to 1,395.79, 1,925.78 and 806.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.79 : 1,925.78 = 806.22 : x
2. Step 2: Convert to fraction form
   1,395.79/1,925.78 = 806.22/x
3. Step 3: Cross multiply
   1,395.79x = 1,925.78 × 806.22
4. Step 4: Simplify right side
   1,395.79x = 1,552,598.32
5. Step 5: Solve for x
   x = 1,552,598.32/1,395.79
6. Step 6: Final answer
   x = 1,112.35