Finding the Fourth Proportional to 1,397.04, 1,927.95 and 807.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.04 : 1,927.95 = 807.78 : x
2. Step 2: Convert to fraction form
   1,397.04/1,927.95 = 807.78/x
3. Step 3: Cross multiply
   1,397.04x = 1,927.95 × 807.78
4. Step 4: Simplify right side
   1,397.04x = 1,557,359.45
5. Step 5: Solve for x
   x = 1,557,359.45/1,397.04
6. Step 6: Final answer
   x = 1,114.76