Finding the Fourth Proportional to 2,378.72, 3,568.12 and 647.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,378.72 : 3,568.12 = 647.34 : x
2. Step 2: Convert to fraction form
   2,378.72/3,568.12 = 647.34/x
3. Step 3: Cross multiply
   2,378.72x = 3,568.12 × 647.34
4. Step 4: Simplify right side
   2,378.72x = 2,309,785.18
5. Step 5: Solve for x
   x = 2,309,785.18/2,378.72
6. Step 6: Final answer
   x = 971.02