Finding the Fourth Proportional to 1,397.29, 1,927.89 and 807.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.29 : 1,927.89 = 807.70 : x
2. Step 2: Convert to fraction form
   1,397.29/1,927.89 = 807.70/x
3. Step 3: Cross multiply
   1,397.29x = 1,927.89 × 807.70
4. Step 4: Simplify right side
   1,397.29x = 1,557,156.75
5. Step 5: Solve for x
   x = 1,557,156.75/1,397.29
6. Step 6: Final answer
   x = 1,114.41