Finding the Fourth Proportional to 1,397.30, 1,928.12 and 807.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.30 : 1,928.12 = 807.62 : x
2. Step 2: Convert to fraction form
   1,397.30/1,928.12 = 807.62/x
3. Step 3: Cross multiply
   1,397.30x = 1,928.12 × 807.62
4. Step 4: Simplify right side
   1,397.30x = 1,557,174.60
5. Step 5: Solve for x
   x = 1,557,174.60/1,397.30
6. Step 6: Final answer
   x = 1,114.42