Finding the Fourth Proportional to 2,378.69, 3,568.03 and 647.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,378.69 : 3,568.03 = 647.31 : x
2. Step 2: Convert to fraction form
   2,378.69/3,568.03 = 647.31/x
3. Step 3: Cross multiply
   2,378.69x = 3,568.03 × 647.31
4. Step 4: Simplify right side
   2,378.69x = 2,309,621.50
5. Step 5: Solve for x
   x = 2,309,621.50/2,378.69
6. Step 6: Final answer
   x = 970.96