Finding the Fourth Proportional to 2,431.86, 3,648.65 and 872.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,431.86 : 3,648.65 = 872.10 : x
2. Step 2: Convert to fraction form
   2,431.86/3,648.65 = 872.10/x
3. Step 3: Cross multiply
   2,431.86x = 3,648.65 × 872.10
4. Step 4: Simplify right side
   2,431.86x = 3,181,983.30
5. Step 5: Solve for x
   x = 3,181,983.30/2,431.86
6. Step 6: Final answer
   x = 1,308.46