Finding the Fourth Proportional to 6,915.78, 10,367.91 and 3,216.06

Step by Step Solution

1. Step 1: Write the proportion equation
   6,915.78 : 10,367.91 = 3,216.06 : x
2. Step 2: Convert to fraction form
   6,915.78/10,367.91 = 3,216.06/x
3. Step 3: Cross multiply
   6,915.78x = 10,367.91 × 3,216.06
4. Step 4: Simplify right side
   6,915.78x = 33,343,820.63
5. Step 5: Solve for x
   x = 33,343,820.63/6,915.78
6. Step 6: Final answer
   x = 4,821.41