Finding the Fourth Proportional to 2,142.39, 2,956.47 and 1,210.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.39 : 2,956.47 = 1,210.89 : x
2. Step 2: Convert to fraction form
   2,142.39/2,956.47 = 1,210.89/x
3. Step 3: Cross multiply
   2,142.39x = 2,956.47 × 1,210.89
4. Step 4: Simplify right side
   2,142.39x = 3,579,959.96
5. Step 5: Solve for x
   x = 3,579,959.96/2,142.39
6. Step 6: Final answer
   x = 1,671.01