Finding the Fourth Proportional to 2,156.59, 2,976.34 and 1,212.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.59 : 2,976.34 = 1,212.38 : x
2. Step 2: Convert to fraction form
   2,156.59/2,976.34 = 1,212.38/x
3. Step 3: Cross multiply
   2,156.59x = 2,976.34 × 1,212.38
4. Step 4: Simplify right side
   2,156.59x = 3,608,455.09
5. Step 5: Solve for x
   x = 3,608,455.09/2,156.59
6. Step 6: Final answer
   x = 1,673.22