Finding the Fourth Proportional to 2,127.34, 2,935.79 and 1,288.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,127.34 : 2,935.79 = 1,288.20 : x
2. Step 2: Convert to fraction form
   2,127.34/2,935.79 = 1,288.20/x
3. Step 3: Cross multiply
   2,127.34x = 2,935.79 × 1,288.20
4. Step 4: Simplify right side
   2,127.34x = 3,781,884.81
5. Step 5: Solve for x
   x = 3,781,884.81/2,127.34
6. Step 6: Final answer
   x = 1,777.75