Finding the Fourth Proportional to 1,399.52, 1,931.46 and 810.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.52 : 1,931.46 = 810.19 : x
2. Step 2: Convert to fraction form
   1,399.52/1,931.46 = 810.19/x
3. Step 3: Cross multiply
   1,399.52x = 1,931.46 × 810.19
4. Step 4: Simplify right side
   1,399.52x = 1,564,849.58
5. Step 5: Solve for x
   x = 1,564,849.58/1,399.52
6. Step 6: Final answer
   x = 1,118.13