Finding the Fourth Proportional to 2,653.56, 3,980.64 and 1,266.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,653.56 : 3,980.64 = 1,266.03 : x
2. Step 2: Convert to fraction form
   2,653.56/3,980.64 = 1,266.03/x
3. Step 3: Cross multiply
   2,653.56x = 3,980.64 × 1,266.03
4. Step 4: Simplify right side
   2,653.56x = 5,039,614.41
5. Step 5: Solve for x
   x = 5,039,614.41/2,653.56
6. Step 6: Final answer
   x = 1,899.19