Finding the Fourth Proportional to 2,931.76, 4,396.83 and 1,287.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,931.76 : 4,396.83 = 1,287.88 : x
2. Step 2: Convert to fraction form
   2,931.76/4,396.83 = 1,287.88/x
3. Step 3: Cross multiply
   2,931.76x = 4,396.83 × 1,287.88
4. Step 4: Simplify right side
   2,931.76x = 5,662,589.42
5. Step 5: Solve for x
   x = 5,662,589.42/2,931.76
6. Step 6: Final answer
   x = 1,931.46