Finding the Fourth Proportional to 2,127.51, 2,935.88 and 1,288.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,127.51 : 2,935.88 = 1,288.56 : x
2. Step 2: Convert to fraction form
   2,127.51/2,935.88 = 1,288.56/x
3. Step 3: Cross multiply
   2,127.51x = 2,935.88 × 1,288.56
4. Step 4: Simplify right side
   2,127.51x = 3,783,051.09
5. Step 5: Solve for x
   x = 3,783,051.09/2,127.51
6. Step 6: Final answer
   x = 1,778.16