Finding the Fourth Proportional to 1,397.18, 1,927.94 and 807.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.18 : 1,927.94 = 807.68 : x
2. Step 2: Convert to fraction form
   1,397.18/1,927.94 = 807.68/x
3. Step 3: Cross multiply
   1,397.18x = 1,927.94 × 807.68
4. Step 4: Simplify right side
   1,397.18x = 1,557,158.58
5. Step 5: Solve for x
   x = 1,557,158.58/1,397.18
6. Step 6: Final answer
   x = 1,114.50