Finding the Fourth Proportional to 2,142.56, 2,956.62 and 1,211

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.56 : 2,956.62 = 1,211 : x
2. Step 2: Convert to fraction form
   2,142.56/2,956.62 = 1,211/x
3. Step 3: Cross multiply
   2,142.56x = 2,956.62 × 1,211
4. Step 4: Simplify right side
   2,142.56x = 3,580,466.82
5. Step 5: Solve for x
   x = 3,580,466.82/2,142.56
6. Step 6: Final answer
   x = 1,671.12