Finding the Fourth Proportional to 2,080.78, 3,118.94 and 1,038.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.78 : 3,118.94 = 1,038.72 : x
2. Step 2: Convert to fraction form
   2,080.78/3,118.94 = 1,038.72/x
3. Step 3: Cross multiply
   2,080.78x = 3,118.94 × 1,038.72
4. Step 4: Simplify right side
   2,080.78x = 3,239,705.36
5. Step 5: Solve for x
   x = 3,239,705.36/2,080.78
6. Step 6: Final answer
   x = 1,556.97