Finding the Fourth Proportional to 2,156.85, 2,976.37 and 1,212.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.85 : 2,976.37 = 1,212.72 : x
2. Step 2: Convert to fraction form
   2,156.85/2,976.37 = 1,212.72/x
3. Step 3: Cross multiply
   2,156.85x = 2,976.37 × 1,212.72
4. Step 4: Simplify right side
   2,156.85x = 3,609,507.84
5. Step 5: Solve for x
   x = 3,609,507.84/2,156.85
6. Step 6: Final answer
   x = 1,673.51