Finding the Fourth Proportional to 2,929.78, 4,397.10 and 1,287.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,929.78 : 4,397.10 = 1,287.10 : x
2. Step 2: Convert to fraction form
   2,929.78/4,397.10 = 1,287.10/x
3. Step 3: Cross multiply
   2,929.78x = 4,397.10 × 1,287.10
4. Step 4: Simplify right side
   2,929.78x = 5,659,507.41
5. Step 5: Solve for x
   x = 5,659,507.41/2,929.78
6. Step 6: Final answer
   x = 1,931.72