Finding the Fourth Proportional to 8,655.34, 12,978.90 and 4,491.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,655.34 : 12,978.90 = 4,491.18 : x
2. Step 2: Convert to fraction form
   8,655.34/12,978.90 = 4,491.18/x
3. Step 3: Cross multiply
   8,655.34x = 12,978.90 × 4,491.18
4. Step 4: Simplify right side
   8,655.34x = 58,290,576.10
5. Step 5: Solve for x
   x = 58,290,576.10/8,655.34
6. Step 6: Final answer
   x = 6,734.64