Finding the Fourth Proportional to 2,128.60, 2,936.37 and 1,243.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.60 : 2,936.37 = 1,243.81 : x
2. Step 2: Convert to fraction form
   2,128.60/2,936.37 = 1,243.81/x
3. Step 3: Cross multiply
   2,128.60x = 2,936.37 × 1,243.81
4. Step 4: Simplify right side
   2,128.60x = 3,652,286.37
5. Step 5: Solve for x
   x = 3,652,286.37/2,128.60
6. Step 6: Final answer
   x = 1,715.82