Finding the Fourth Proportional to 3,786.52, 5,680.55 and 1,320.68

Step by Step Solution

1. Step 1: Write the proportion equation
   3,786.52 : 5,680.55 = 1,320.68 : x
2. Step 2: Convert to fraction form
   3,786.52/5,680.55 = 1,320.68/x
3. Step 3: Cross multiply
   3,786.52x = 5,680.55 × 1,320.68
4. Step 4: Simplify right side
   3,786.52x = 7,502,182.87
5. Step 5: Solve for x
   x = 7,502,182.87/3,786.52
6. Step 6: Final answer
   x = 1,981.29