Finding the Fourth Proportional to 2,189.61, 3,021.55 and 1,245.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.61 : 3,021.55 = 1,245.29 : x
2. Step 2: Convert to fraction form
   2,189.61/3,021.55 = 1,245.29/x
3. Step 3: Cross multiply
   2,189.61x = 3,021.55 × 1,245.29
4. Step 4: Simplify right side
   2,189.61x = 3,762,687.78
5. Step 5: Solve for x
   x = 3,762,687.78/2,189.61
6. Step 6: Final answer
   x = 1,718.43