Finding the Fourth Proportional to 2,108.25, 3,162.69 and 647.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.25 : 3,162.69 = 647.28 : x
2. Step 2: Convert to fraction form
   2,108.25/3,162.69 = 647.28/x
3. Step 3: Cross multiply
   2,108.25x = 3,162.69 × 647.28
4. Step 4: Simplify right side
   2,108.25x = 2,047,145.98
5. Step 5: Solve for x
   x = 2,047,145.98/2,108.25
6. Step 6: Final answer
   x = 971.02