Finding the Fourth Proportional to 2,880.69, 4,321.38 and 1,031.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,880.69 : 4,321.38 = 1,031.31 : x
2. Step 2: Convert to fraction form
   2,880.69/4,321.38 = 1,031.31/x
3. Step 3: Cross multiply
   2,880.69x = 4,321.38 × 1,031.31
4. Step 4: Simplify right side
   2,880.69x = 4,456,665.42
5. Step 5: Solve for x
   x = 4,456,665.42/2,880.69
6. Step 6: Final answer
   x = 1,547.08