Finding the Fourth Proportional to 10,640.34, 15,944.31 and 5,086.05

Step by Step Solution

1. Step 1: Write the proportion equation
   10,640.34 : 15,944.31 = 5,086.05 : x
2. Step 2: Convert to fraction form
   10,640.34/15,944.31 = 5,086.05/x
3. Step 3: Cross multiply
   10,640.34x = 15,944.31 × 5,086.05
4. Step 4: Simplify right side
   10,640.34x = 81,093,557.88
5. Step 5: Solve for x
   x = 81,093,557.88/10,640.34
6. Step 6: Final answer
   x = 7,621.33