Finding the Fourth Proportional to 1,399.31, 1,930.72 and 1,119.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.31 : 1,930.72 = 1,119.79 : x
2. Step 2: Convert to fraction form
   1,399.31/1,930.72 = 1,119.79/x
3. Step 3: Cross multiply
   1,399.31x = 1,930.72 × 1,119.79
4. Step 4: Simplify right side
   1,399.31x = 2,162,000.95
5. Step 5: Solve for x
   x = 2,162,000.95/1,399.31
6. Step 6: Final answer
   x = 1,545.05