Finding the Fourth Proportional to 2,079.20, 3,117.72 and 1,038.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.20 : 3,117.72 = 1,038.08 : x
2. Step 2: Convert to fraction form
   2,079.20/3,117.72 = 1,038.08/x
3. Step 3: Cross multiply
   2,079.20x = 3,117.72 × 1,038.08
4. Step 4: Simplify right side
   2,079.20x = 3,236,442.78
5. Step 5: Solve for x
   x = 3,236,442.78/2,079.20
6. Step 6: Final answer
   x = 1,556.58