Finding the Fourth Proportional to 3,186.34, 4,771.42 and 2,665.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,186.34 : 4,771.42 = 2,665.05 : x
2. Step 2: Convert to fraction form
   3,186.34/4,771.42 = 2,665.05/x
3. Step 3: Cross multiply
   3,186.34x = 4,771.42 × 2,665.05
4. Step 4: Simplify right side
   3,186.34x = 12,716,090.15
5. Step 5: Solve for x
   x = 12,716,090.15/3,186.34
6. Step 6: Final answer
   x = 3,990.82