Finding the Fourth Proportional to 11,762.78, 17,645.61 and 3,969.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,762.78 : 17,645.61 = 3,969.50 : x
2. Step 2: Convert to fraction form
   11,762.78/17,645.61 = 3,969.50/x
3. Step 3: Cross multiply
   11,762.78x = 17,645.61 × 3,969.50
4. Step 4: Simplify right side
   11,762.78x = 70,044,248.90
5. Step 5: Solve for x
   x = 70,044,248.90/11,762.78
6. Step 6: Final answer
   x = 5,954.74