Finding the Fourth Proportional to 3,856.56, 5,783.28 and 1,223.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,856.56 : 5,783.28 = 1,223.20 : x
2. Step 2: Convert to fraction form
   3,856.56/5,783.28 = 1,223.20/x
3. Step 3: Cross multiply
   3,856.56x = 5,783.28 × 1,223.20
4. Step 4: Simplify right side
   3,856.56x = 7,074,108.10
5. Step 5: Solve for x
   x = 7,074,108.10/3,856.56
6. Step 6: Final answer
   x = 1,834.31