Finding the Fourth Proportional to 2,145.89, 2,961.25 and 1,214.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.89 : 2,961.25 = 1,214.39 : x
2. Step 2: Convert to fraction form
   2,145.89/2,961.25 = 1,214.39/x
3. Step 3: Cross multiply
   2,145.89x = 2,961.25 × 1,214.39
4. Step 4: Simplify right side
   2,145.89x = 3,596,116.75
5. Step 5: Solve for x
   x = 3,596,116.75/2,145.89
6. Step 6: Final answer
   x = 1,675.81