Finding the Fourth Proportional to 2,142.09, 2,956.05 and 1,245.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.09 : 2,956.05 = 1,245.87 : x
2. Step 2: Convert to fraction form
   2,142.09/2,956.05 = 1,245.87/x
3. Step 3: Cross multiply
   2,142.09x = 2,956.05 × 1,245.87
4. Step 4: Simplify right side
   2,142.09x = 3,682,854.01
5. Step 5: Solve for x
   x = 3,682,854.01/2,142.09
6. Step 6: Final answer
   x = 1,719.28