Finding the Fourth Proportional to 2,069.71, 2,856.20 and 1,138.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.71 : 2,856.20 = 1,138.21 : x
2. Step 2: Convert to fraction form
   2,069.71/2,856.20 = 1,138.21/x
3. Step 3: Cross multiply
   2,069.71x = 2,856.20 × 1,138.21
4. Step 4: Simplify right side
   2,069.71x = 3,250,943.64
5. Step 5: Solve for x
   x = 3,250,943.64/2,069.71
6. Step 6: Final answer
   x = 1,570.73