Finding the Fourth Proportional to 2,931.45, 4,397.94 and 1,288.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,931.45 : 4,397.94 = 1,288.32 : x
2. Step 2: Convert to fraction form
   2,931.45/4,397.94 = 1,288.32/x
3. Step 3: Cross multiply
   2,931.45x = 4,397.94 × 1,288.32
4. Step 4: Simplify right side
   2,931.45x = 5,665,954.06
5. Step 5: Solve for x
   x = 5,665,954.06/2,931.45
6. Step 6: Final answer
   x = 1,932.82