Finding the Fourth Proportional to 3,547.05, 5,321.15 and 1,081.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,547.05 : 5,321.15 = 1,081.31 : x
2. Step 2: Convert to fraction form
   3,547.05/5,321.15 = 1,081.31/x
3. Step 3: Cross multiply
   3,547.05x = 5,321.15 × 1,081.31
4. Step 4: Simplify right side
   3,547.05x = 5,753,780.69
5. Step 5: Solve for x
   x = 5,753,780.69/3,547.05
6. Step 6: Final answer
   x = 1,622.13