Finding the Fourth Proportional to 2,189.69, 3,021.51 and 1,245.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.69 : 3,021.51 = 1,245.60 : x
2. Step 2: Convert to fraction form
   2,189.69/3,021.51 = 1,245.60/x
3. Step 3: Cross multiply
   2,189.69x = 3,021.51 × 1,245.60
4. Step 4: Simplify right side
   2,189.69x = 3,763,591.96
5. Step 5: Solve for x
   x = 3,763,591.96/2,189.69
6. Step 6: Final answer
   x = 1,718.78