Finding the Fourth Proportional to 3,969.88, 5,957.55 and 1,781.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.88 : 5,957.55 = 1,781.06 : x
2. Step 2: Convert to fraction form
   3,969.88/5,957.55 = 1,781.06/x
3. Step 3: Cross multiply
   3,969.88x = 5,957.55 × 1,781.06
4. Step 4: Simplify right side
   3,969.88x = 10,610,724.22
5. Step 5: Solve for x
   x = 10,610,724.22/3,969.88
6. Step 6: Final answer
   x = 2,672.81