Finding the Fourth Proportional to 1,399.65, 1,930.68 and 1,067.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.65 : 1,930.68 = 1,067.55 : x
2. Step 2: Convert to fraction form
   1,399.65/1,930.68 = 1,067.55/x
3. Step 3: Cross multiply
   1,399.65x = 1,930.68 × 1,067.55
4. Step 4: Simplify right side
   1,399.65x = 2,061,097.43
5. Step 5: Solve for x
   x = 2,061,097.43/1,399.65
6. Step 6: Final answer
   x = 1,472.58