Finding the Fourth Proportional to 8,461.20, 11,680.71 and 5,479.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,461.20 : 11,680.71 = 5,479.47 : x
2. Step 2: Convert to fraction form
   8,461.20/11,680.71 = 5,479.47/x
3. Step 3: Cross multiply
   8,461.20x = 11,680.71 × 5,479.47
4. Step 4: Simplify right side
   8,461.20x = 64,004,100.02
5. Step 5: Solve for x
   x = 64,004,100.02/8,461.20
6. Step 6: Final answer
   x = 7,564.42