Finding the Fourth Proportional to 1,399.46, 1,931.58 and 810.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.46 : 1,931.58 = 810.32 : x
2. Step 2: Convert to fraction form
   1,399.46/1,931.58 = 810.32/x
3. Step 3: Cross multiply
   1,399.46x = 1,931.58 × 810.32
4. Step 4: Simplify right side
   1,399.46x = 1,565,188.25
5. Step 5: Solve for x
   x = 1,565,188.25/1,399.46
6. Step 6: Final answer
   x = 1,118.43