Finding the Fourth Proportional to 2,108.31, 3,162.48 and 647.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.31 : 3,162.48 = 647.48 : x
2. Step 2: Convert to fraction form
   2,108.31/3,162.48 = 647.48/x
3. Step 3: Cross multiply
   2,108.31x = 3,162.48 × 647.48
4. Step 4: Simplify right side
   2,108.31x = 2,047,642.55
5. Step 5: Solve for x
   x = 2,047,642.55/2,108.31
6. Step 6: Final answer
   x = 971.22