Finding the Fourth Proportional to 2,147.04, 3,218.20 and 1,405.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.04 : 3,218.20 = 1,405.76 : x
2. Step 2: Convert to fraction form
   2,147.04/3,218.20 = 1,405.76/x
3. Step 3: Cross multiply
   2,147.04x = 3,218.20 × 1,405.76
4. Step 4: Simplify right side
   2,147.04x = 4,524,016.83
5. Step 5: Solve for x
   x = 4,524,016.83/2,147.04
6. Step 6: Final answer
   x = 2,107.09