Finding the Fourth Proportional to 2,140.72, 2,954.22 and 1,209.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.72 : 2,954.22 = 1,209.22 : x
2. Step 2: Convert to fraction form
   2,140.72/2,954.22 = 1,209.22/x
3. Step 3: Cross multiply
   2,140.72x = 2,954.22 × 1,209.22
4. Step 4: Simplify right side
   2,140.72x = 3,572,301.91
5. Step 5: Solve for x
   x = 3,572,301.91/2,140.72
6. Step 6: Final answer
   x = 1,668.74