Finding the Fourth Proportional to 7,887.80, 10,851.62 and 7,669.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,887.80 : 10,851.62 = 7,669.10 : x
2. Step 2: Convert to fraction form
   7,887.80/10,851.62 = 7,669.10/x
3. Step 3: Cross multiply
   7,887.80x = 10,851.62 × 7,669.10
4. Step 4: Simplify right side
   7,887.80x = 83,222,158.94
5. Step 5: Solve for x
   x = 83,222,158.94/7,887.80
6. Step 6: Final answer
   x = 10,550.74