Finding the Fourth Proportional to 1,399.41, 1,931.54 and 810.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.41 : 1,931.54 = 810.32 : x
2. Step 2: Convert to fraction form
   1,399.41/1,931.54 = 810.32/x
3. Step 3: Cross multiply
   1,399.41x = 1,931.54 × 810.32
4. Step 4: Simplify right side
   1,399.41x = 1,565,165.49
5. Step 5: Solve for x
   x = 1,565,165.49/1,399.41
6. Step 6: Final answer
   x = 1,118.45