Finding the Fourth Proportional to 3,957.63, 5,461.40 and 2,189.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,957.63 : 5,461.40 = 2,189.31 : x
2. Step 2: Convert to fraction form
   3,957.63/5,461.40 = 2,189.31/x
3. Step 3: Cross multiply
   3,957.63x = 5,461.40 × 2,189.31
4. Step 4: Simplify right side
   3,957.63x = 11,956,686.69
5. Step 5: Solve for x
   x = 11,956,686.69/3,957.63
6. Step 6: Final answer
   x = 3,021.17