Finding the Fourth Proportional to 1,397.43, 1,928.57 and 807.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.43 : 1,928.57 = 807.98 : x
2. Step 2: Convert to fraction form
   1,397.43/1,928.57 = 807.98/x
3. Step 3: Cross multiply
   1,397.43x = 1,928.57 × 807.98
4. Step 4: Simplify right side
   1,397.43x = 1,558,232.31
5. Step 5: Solve for x
   x = 1,558,232.31/1,397.43
6. Step 6: Final answer
   x = 1,115.07