Finding the Fourth Proportional to 2,127.88, 2,936.54 and 1,288.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,127.88 : 2,936.54 = 1,288.74 : x
2. Step 2: Convert to fraction form
   2,127.88/2,936.54 = 1,288.74/x
3. Step 3: Cross multiply
   2,127.88x = 2,936.54 × 1,288.74
4. Step 4: Simplify right side
   2,127.88x = 3,784,436.56
5. Step 5: Solve for x
   x = 3,784,436.56/2,127.88
6. Step 6: Final answer
   x = 1,778.50