Finding the Fourth Proportional to 2,385.20, 3,579.36 and 1,086.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.20 : 3,579.36 = 1,086.56 : x
2. Step 2: Convert to fraction form
   2,385.20/3,579.36 = 1,086.56/x
3. Step 3: Cross multiply
   2,385.20x = 3,579.36 × 1,086.56
4. Step 4: Simplify right side
   2,385.20x = 3,889,189.40
5. Step 5: Solve for x
   x = 3,889,189.40/2,385.20
6. Step 6: Final answer
   x = 1,630.55