Finding the Fourth Proportional to 11,661.76, 17,488.59 and 3,868.75

Step by Step Solution

1. Step 1: Write the proportion equation
   11,661.76 : 17,488.59 = 3,868.75 : x
2. Step 2: Convert to fraction form
   11,661.76/17,488.59 = 3,868.75/x
3. Step 3: Cross multiply
   11,661.76x = 17,488.59 × 3,868.75
4. Step 4: Simplify right side
   11,661.76x = 67,658,982.56
5. Step 5: Solve for x
   x = 67,658,982.56/11,661.76
6. Step 6: Final answer
   x = 5,801.78