Finding the Fourth Proportional to 8,718.69, 13,081.72 and 4,213.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,718.69 : 13,081.72 = 4,213.47 : x
2. Step 2: Convert to fraction form
   8,718.69/13,081.72 = 4,213.47/x
3. Step 3: Cross multiply
   8,718.69x = 13,081.72 × 4,213.47
4. Step 4: Simplify right side
   8,718.69x = 55,119,434.77
5. Step 5: Solve for x
   x = 55,119,434.77/8,718.69
6. Step 6: Final answer
   x = 6,321.99