Finding the Fourth Proportional to 7,891.80, 10,857.15 and 7,673.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,891.80 : 10,857.15 = 7,673.10 : x
2. Step 2: Convert to fraction form
   7,891.80/10,857.15 = 7,673.10/x
3. Step 3: Cross multiply
   7,891.80x = 10,857.15 × 7,673.10
4. Step 4: Simplify right side
   7,891.80x = 83,307,997.67
5. Step 5: Solve for x
   x = 83,307,997.67/7,891.80
6. Step 6: Final answer
   x = 10,556.27