Finding the Fourth Proportional to 3,685.59, 5,519.88 and 2,221.53

Step by Step Solution

1. Step 1: Write the proportion equation
   3,685.59 : 5,519.88 = 2,221.53 : x
2. Step 2: Convert to fraction form
   3,685.59/5,519.88 = 2,221.53/x
3. Step 3: Cross multiply
   3,685.59x = 5,519.88 × 2,221.53
4. Step 4: Simplify right side
   3,685.59x = 12,262,579.02
5. Step 5: Solve for x
   x = 12,262,579.02/3,685.59
6. Step 6: Final answer
   x = 3,327.17