Finding the Fourth Proportional to 2,189.46, 3,021.52 and 1,245.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.46 : 3,021.52 = 1,245.28 : x
2. Step 2: Convert to fraction form
   2,189.46/3,021.52 = 1,245.28/x
3. Step 3: Cross multiply
   2,189.46x = 3,021.52 × 1,245.28
4. Step 4: Simplify right side
   2,189.46x = 3,762,638.43
5. Step 5: Solve for x
   x = 3,762,638.43/2,189.46
6. Step 6: Final answer
   x = 1,718.52