Finding the Fourth Proportional to 11,820.75, 17,726.76 and 3,921.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,820.75 : 17,726.76 = 3,921.18 : x
2. Step 2: Convert to fraction form
   11,820.75/17,726.76 = 3,921.18/x
3. Step 3: Cross multiply
   11,820.75x = 17,726.76 × 3,921.18
4. Step 4: Simplify right side
   11,820.75x = 69,509,816.78
5. Step 5: Solve for x
   x = 69,509,816.78/11,820.75
6. Step 6: Final answer
   x = 5,880.32