Finding the Fourth Proportional to 1,399.53, 1,931.70 and 810.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.53 : 1,931.70 = 810.41 : x
2. Step 2: Convert to fraction form
   1,399.53/1,931.70 = 810.41/x
3. Step 3: Cross multiply
   1,399.53x = 1,931.70 × 810.41
4. Step 4: Simplify right side
   1,399.53x = 1,565,469.00
5. Step 5: Solve for x
   x = 1,565,469.00/1,399.53
6. Step 6: Final answer
   x = 1,118.57