Finding the Fourth Proportional to 2,128.38, 2,936.88 and 1,243.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.38 : 2,936.88 = 1,243.50 : x
2. Step 2: Convert to fraction form
   2,128.38/2,936.88 = 1,243.50/x
3. Step 3: Cross multiply
   2,128.38x = 2,936.88 × 1,243.50
4. Step 4: Simplify right side
   2,128.38x = 3,652,010.28
5. Step 5: Solve for x
   x = 3,652,010.28/2,128.38
6. Step 6: Final answer
   x = 1,715.86