Finding the Fourth Proportional to 3,856.32, 5,780.16 and 1,800

Step by Step Solution

1. Step 1: Write the proportion equation
   3,856.32 : 5,780.16 = 1,800 : x
2. Step 2: Convert to fraction form
   3,856.32/5,780.16 = 1,800/x
3. Step 3: Cross multiply
   3,856.32x = 5,780.16 × 1,800
4. Step 4: Simplify right side
   3,856.32x = 10,404,288
5. Step 5: Solve for x
   x = 10,404,288/3,856.32
6. Step 6: Final answer
   x = 2,697.98