Finding the Fourth Proportional to 1,399.99, 1,931.82 and 810.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.99 : 1,931.82 = 810.41 : x
2. Step 2: Convert to fraction form
   1,399.99/1,931.82 = 810.41/x
3. Step 3: Cross multiply
   1,399.99x = 1,931.82 × 810.41
4. Step 4: Simplify right side
   1,399.99x = 1,565,566.25
5. Step 5: Solve for x
   x = 1,565,566.25/1,399.99
6. Step 6: Final answer
   x = 1,118.27