Finding the Fourth Proportional to 2,069.96, 2,856.05 and 1,399.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.96 : 2,856.05 = 1,399.01 : x
2. Step 2: Convert to fraction form
   2,069.96/2,856.05 = 1,399.01/x
3. Step 3: Cross multiply
   2,069.96x = 2,856.05 × 1,399.01
4. Step 4: Simplify right side
   2,069.96x = 3,995,647.79
5. Step 5: Solve for x
   x = 3,995,647.79/2,069.96
6. Step 6: Final answer
   x = 1,930.30