Finding the Fourth Proportional to 1,648.72, 2,468.26 and 866.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.72 : 2,468.26 = 866.86 : x
2. Step 2: Convert to fraction form
   1,648.72/2,468.26 = 866.86/x
3. Step 3: Cross multiply
   1,648.72x = 2,468.26 × 866.86
4. Step 4: Simplify right side
   1,648.72x = 2,139,635.86
5. Step 5: Solve for x
   x = 2,139,635.86/1,648.72
6. Step 6: Final answer
   x = 1,297.76