Finding the Fourth Proportional to 2,053.78, 3,080.31 and 668.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,053.78 : 3,080.31 = 668.10 : x
2. Step 2: Convert to fraction form
   2,053.78/3,080.31 = 668.10/x
3. Step 3: Cross multiply
   2,053.78x = 3,080.31 × 668.10
4. Step 4: Simplify right side
   2,053.78x = 2,057,955.11
5. Step 5: Solve for x
   x = 2,057,955.11/2,053.78
6. Step 6: Final answer
   x = 1,002.03