Finding the Fourth Proportional to 3,786.42, 5,680.56 and 1,813.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,786.42 : 5,680.56 = 1,813.55 : x
2. Step 2: Convert to fraction form
   3,786.42/5,680.56 = 1,813.55/x
3. Step 3: Cross multiply
   3,786.42x = 5,680.56 × 1,813.55
4. Step 4: Simplify right side
   3,786.42x = 10,301,979.59
5. Step 5: Solve for x
   x = 10,301,979.59/3,786.42
6. Step 6: Final answer
   x = 2,720.77