Finding the Fourth Proportional to 3,867.30, 5,809.59 and 3,721.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,867.30 : 5,809.59 = 3,721.50 : x
2. Step 2: Convert to fraction form
   3,867.30/5,809.59 = 3,721.50/x
3. Step 3: Cross multiply
   3,867.30x = 5,809.59 × 3,721.50
4. Step 4: Simplify right side
   3,867.30x = 21,620,389.19
5. Step 5: Solve for x
   x = 21,620,389.19/3,867.30
6. Step 6: Final answer
   x = 5,590.56