Finding the Fourth Proportional to 2,218.72, 3,322.39 and 2,153.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.72 : 3,322.39 = 2,153.03 : x
2. Step 2: Convert to fraction form
   2,218.72/3,322.39 = 2,153.03/x
3. Step 3: Cross multiply
   2,218.72x = 3,322.39 × 2,153.03
4. Step 4: Simplify right side
   2,218.72x = 7,153,193.61
5. Step 5: Solve for x
   x = 7,153,193.61/2,218.72
6. Step 6: Final answer
   x = 3,224.02