Finding the Fourth Proportional to 1,399.55, 1,931.63 and 810.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.55 : 1,931.63 = 810.44 : x
2. Step 2: Convert to fraction form
   1,399.55/1,931.63 = 810.44/x
3. Step 3: Cross multiply
   1,399.55x = 1,931.63 × 810.44
4. Step 4: Simplify right side
   1,399.55x = 1,565,456.51
5. Step 5: Solve for x
   x = 1,565,456.51/1,399.55
6. Step 6: Final answer
   x = 1,118.54