Finding the Fourth Proportional to 2,142.50, 2,956.65 and 1,211

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.50 : 2,956.65 = 1,211 : x
2. Step 2: Convert to fraction form
   2,142.50/2,956.65 = 1,211/x
3. Step 3: Cross multiply
   2,142.50x = 2,956.65 × 1,211
4. Step 4: Simplify right side
   2,142.50x = 3,580,503.15
5. Step 5: Solve for x
   x = 3,580,503.15/2,142.50
6. Step 6: Final answer
   x = 1,671.18