Finding the Fourth Proportional to 2,656.32, 3,983.84 and 1,288

Step by Step Solution

1. Step 1: Write the proportion equation
   2,656.32 : 3,983.84 = 1,288 : x
2. Step 2: Convert to fraction form
   2,656.32/3,983.84 = 1,288/x
3. Step 3: Cross multiply
   2,656.32x = 3,983.84 × 1,288
4. Step 4: Simplify right side
   2,656.32x = 5,131,185.92
5. Step 5: Solve for x
   x = 5,131,185.92/2,656.32
6. Step 6: Final answer
   x = 1,931.69