Finding the Fourth Proportional to 2,151.54, 2,968.89 and 1,207.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.54 : 2,968.89 = 1,207.21 : x
2. Step 2: Convert to fraction form
   2,151.54/2,968.89 = 1,207.21/x
3. Step 3: Cross multiply
   2,151.54x = 2,968.89 × 1,207.21
4. Step 4: Simplify right side
   2,151.54x = 3,584,061.75
5. Step 5: Solve for x
   x = 3,584,061.75/2,151.54
6. Step 6: Final answer
   x = 1,665.81