Finding the Fourth Proportional to 1,399.97, 1,931.82 and 810.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.97 : 1,931.82 = 810.70 : x
2. Step 2: Convert to fraction form
   1,399.97/1,931.82 = 810.70/x
3. Step 3: Cross multiply
   1,399.97x = 1,931.82 × 810.70
4. Step 4: Simplify right side
   1,399.97x = 1,566,116.81
5. Step 5: Solve for x
   x = 1,566,116.81/1,399.97
6. Step 6: Final answer
   x = 1,118.68