Finding the Fourth Proportional to 2,931.46, 4,396.71 and 1,287.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,931.46 : 4,396.71 = 1,287.70 : x
2. Step 2: Convert to fraction form
   2,931.46/4,396.71 = 1,287.70/x
3. Step 3: Cross multiply
   2,931.46x = 4,396.71 × 1,287.70
4. Step 4: Simplify right side
   2,931.46x = 5,661,637.30
5. Step 5: Solve for x
   x = 5,661,637.30/2,931.46
6. Step 6: Final answer
   x = 1,931.34