Finding the Fourth Proportional to 2,649.81, 3,971.69 and 1,261.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,649.81 : 3,971.69 = 1,261.18 : x
2. Step 2: Convert to fraction form
   2,649.81/3,971.69 = 1,261.18/x
3. Step 3: Cross multiply
   2,649.81x = 3,971.69 × 1,261.18
4. Step 4: Simplify right side
   2,649.81x = 5,009,015.99
5. Step 5: Solve for x
   x = 5,009,015.99/2,649.81
6. Step 6: Final answer
   x = 1,890.33