Finding the Fourth Proportional to 1,399.53, 1,932.01 and 809.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.53 : 1,932.01 = 809.95 : x
2. Step 2: Convert to fraction form
   1,399.53/1,932.01 = 809.95/x
3. Step 3: Cross multiply
   1,399.53x = 1,932.01 × 809.95
4. Step 4: Simplify right side
   1,399.53x = 1,564,831.89
5. Step 5: Solve for x
   x = 1,564,831.89/1,399.53
6. Step 6: Final answer
   x = 1,118.11