Finding the Fourth Proportional to 3,665.12, 5,503.36 and 2,210.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.12 : 5,503.36 = 2,210.72 : x
2. Step 2: Convert to fraction form
   3,665.12/5,503.36 = 2,210.72/x
3. Step 3: Cross multiply
   3,665.12x = 5,503.36 × 2,210.72
4. Step 4: Simplify right side
   3,665.12x = 12,166,388.02
5. Step 5: Solve for x
   x = 12,166,388.02/3,665.12
6. Step 6: Final answer
   x = 3,319.51