Finding the Fourth Proportional to 2,142.59, 2,956.30 and 1,211.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.59 : 2,956.30 = 1,211.09 : x
2. Step 2: Convert to fraction form
   2,142.59/2,956.30 = 1,211.09/x
3. Step 3: Cross multiply
   2,142.59x = 2,956.30 × 1,211.09
4. Step 4: Simplify right side
   2,142.59x = 3,580,327.56
5. Step 5: Solve for x
   x = 3,580,327.56/2,142.59
6. Step 6: Final answer
   x = 1,671.03