Finding the Fourth Proportional to 2,647.32, 3,970.89 and 1,261.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.32 : 3,970.89 = 1,261.32 : x
2. Step 2: Convert to fraction form
   2,647.32/3,970.89 = 1,261.32/x
3. Step 3: Cross multiply
   2,647.32x = 3,970.89 × 1,261.32
4. Step 4: Simplify right side
   2,647.32x = 5,008,562.97
5. Step 5: Solve for x
   x = 5,008,562.97/2,647.32
6. Step 6: Final answer
   x = 1,891.94