Finding the Fourth Proportional to 1,395.72, 1,925.96 and 806.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.72 : 1,925.96 = 806.45 : x
2. Step 2: Convert to fraction form
   1,395.72/1,925.96 = 806.45/x
3. Step 3: Cross multiply
   1,395.72x = 1,925.96 × 806.45
4. Step 4: Simplify right side
   1,395.72x = 1,553,176.78
5. Step 5: Solve for x
   x = 1,553,176.78/1,395.72
6. Step 6: Final answer
   x = 1,112.81