Finding the Fourth Proportional to 2,156.96, 2,975.86 and 1,212.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.96 : 2,975.86 = 1,212.56 : x
2. Step 2: Convert to fraction form
   2,156.96/2,975.86 = 1,212.56/x
3. Step 3: Cross multiply
   2,156.96x = 2,975.86 × 1,212.56
4. Step 4: Simplify right side
   2,156.96x = 3,608,408.80
5. Step 5: Solve for x
   x = 3,608,408.80/2,156.96
6. Step 6: Final answer
   x = 1,672.91