Finding the Fourth Proportional to 2,647.47, 3,971.11 and 1,261.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.47 : 3,971.11 = 1,261.36 : x
2. Step 2: Convert to fraction form
   2,647.47/3,971.11 = 1,261.36/x
3. Step 3: Cross multiply
   2,647.47x = 3,971.11 × 1,261.36
4. Step 4: Simplify right side
   2,647.47x = 5,008,999.31
5. Step 5: Solve for x
   x = 5,008,999.31/2,647.47
6. Step 6: Final answer
   x = 1,891.99