Finding the Fourth Proportional to 2,145.96, 2,961.86 and 1,214.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.96 : 2,961.86 = 1,214.76 : x
2. Step 2: Convert to fraction form
   2,145.96/2,961.86 = 1,214.76/x
3. Step 3: Cross multiply
   2,145.96x = 2,961.86 × 1,214.76
4. Step 4: Simplify right side
   2,145.96x = 3,597,949.05
5. Step 5: Solve for x
   x = 3,597,949.05/2,145.96
6. Step 6: Final answer
   x = 1,676.62