Finding the Fourth Proportional to 2,086.72, 2,879.48 and 1,202.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.72 : 2,879.48 = 1,202.40 : x
2. Step 2: Convert to fraction form
   2,086.72/2,879.48 = 1,202.40/x
3. Step 3: Cross multiply
   2,086.72x = 2,879.48 × 1,202.40
4. Step 4: Simplify right side
   2,086.72x = 3,462,289.76
5. Step 5: Solve for x
   x = 3,462,289.76/2,086.72
6. Step 6: Final answer
   x = 1,659.20