Finding the Fourth Proportional to 2,156.83, 2,976.59 and 1,212.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.83 : 2,976.59 = 1,212.85 : x
2. Step 2: Convert to fraction form
   2,156.83/2,976.59 = 1,212.85/x
3. Step 3: Cross multiply
   2,156.83x = 2,976.59 × 1,212.85
4. Step 4: Simplify right side
   2,156.83x = 3,610,163.93
5. Step 5: Solve for x
   x = 3,610,163.93/2,156.83
6. Step 6: Final answer
   x = 1,673.83