Finding the Fourth Proportional to 6,109.95, 8,431.72 and 3,315.45

Step by Step Solution

1. Step 1: Write the proportion equation
   6,109.95 : 8,431.72 = 3,315.45 : x
2. Step 2: Convert to fraction form
   6,109.95/8,431.72 = 3,315.45/x
3. Step 3: Cross multiply
   6,109.95x = 8,431.72 × 3,315.45
4. Step 4: Simplify right side
   6,109.95x = 27,954,940.63
5. Step 5: Solve for x
   x = 27,954,940.63/6,109.95
6. Step 6: Final answer
   x = 4,575.32