Finding the Fourth Proportional to 7,080.28, 9,780.78 and 5,673.31

Step by Step Solution

1. Step 1: Write the proportion equation
   7,080.28 : 9,780.78 = 5,673.31 : x
2. Step 2: Convert to fraction form
   7,080.28/9,780.78 = 5,673.31/x
3. Step 3: Cross multiply
   7,080.28x = 9,780.78 × 5,673.31
4. Step 4: Simplify right side
   7,080.28x = 55,489,396.98
5. Step 5: Solve for x
   x = 55,489,396.98/7,080.28
6. Step 6: Final answer
   x = 7,837.18