Finding the Fourth Proportional to 3,655.89, 5,440.05 and 3,643.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,655.89 : 5,440.05 = 3,643.56 : x
2. Step 2: Convert to fraction form
   3,655.89/5,440.05 = 3,643.56/x
3. Step 3: Cross multiply
   3,655.89x = 5,440.05 × 3,643.56
4. Step 4: Simplify right side
   3,655.89x = 19,821,148.58
5. Step 5: Solve for x
   x = 19,821,148.58/3,655.89
6. Step 6: Final answer
   x = 5,421.70