Finding the Fourth Proportional to 3,945.80, 5,917.47 and 3,687

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945.80 : 5,917.47 = 3,687 : x
2. Step 2: Convert to fraction form
   3,945.80/5,917.47 = 3,687/x
3. Step 3: Cross multiply
   3,945.80x = 5,917.47 × 3,687
4. Step 4: Simplify right side
   3,945.80x = 21,817,711.89
5. Step 5: Solve for x
   x = 21,817,711.89/3,945.80
6. Step 6: Final answer
   x = 5,529.36