Finding the Fourth Proportional to 2,156.71, 2,976.18 and 1,212.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.71 : 2,976.18 = 1,212.49 : x
2. Step 2: Convert to fraction form
   2,156.71/2,976.18 = 1,212.49/x
3. Step 3: Cross multiply
   2,156.71x = 2,976.18 × 1,212.49
4. Step 4: Simplify right side
   2,156.71x = 3,608,588.49
5. Step 5: Solve for x
   x = 3,608,588.49/2,156.71
6. Step 6: Final answer
   x = 1,673.19