Finding the Fourth Proportional to 2,151.69, 2,969.54 and 1,207.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.69 : 2,969.54 = 1,207.49 : x
2. Step 2: Convert to fraction form
   2,151.69/2,969.54 = 1,207.49/x
3. Step 3: Cross multiply
   2,151.69x = 2,969.54 × 1,207.49
4. Step 4: Simplify right side
   2,151.69x = 3,585,678.03
5. Step 5: Solve for x
   x = 3,585,678.03/2,151.69
6. Step 6: Final answer
   x = 1,666.45