Finding the Fourth Proportional to 3,918.63, 5,406.71 and 2,345.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,918.63 : 5,406.71 = 2,345.61 : x
2. Step 2: Convert to fraction form
   3,918.63/5,406.71 = 2,345.61/x
3. Step 3: Cross multiply
   3,918.63x = 5,406.71 × 2,345.61
4. Step 4: Simplify right side
   3,918.63x = 12,682,021.32
5. Step 5: Solve for x
   x = 12,682,021.32/3,918.63
6. Step 6: Final answer
   x = 3,236.34