Finding the Fourth Proportional to 1,397.09, 1,927.83 and 807.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.09 : 1,927.83 = 807.81 : x
2. Step 2: Convert to fraction form
   1,397.09/1,927.83 = 807.81/x
3. Step 3: Cross multiply
   1,397.09x = 1,927.83 × 807.81
4. Step 4: Simplify right side
   1,397.09x = 1,557,320.35
5. Step 5: Solve for x
   x = 1,557,320.35/1,397.09
6. Step 6: Final answer
   x = 1,114.69