Finding the Fourth Proportional to 11,619.34, 17,423.67 and 3,720.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,619.34 : 17,423.67 = 3,720.31 : x
2. Step 2: Convert to fraction form
   11,619.34/17,423.67 = 3,720.31/x
3. Step 3: Cross multiply
   11,619.34x = 17,423.67 × 3,720.31
4. Step 4: Simplify right side
   11,619.34x = 64,821,453.74
5. Step 5: Solve for x
   x = 64,821,453.74/11,619.34
6. Step 6: Final answer
   x = 5,578.76