Finding the Fourth Proportional to 8,655.48, 12,978.59 and 4,485.14

Step by Step Solution

1. Step 1: Write the proportion equation
   8,655.48 : 12,978.59 = 4,485.14 : x
2. Step 2: Convert to fraction form
   8,655.48/12,978.59 = 4,485.14/x
3. Step 3: Cross multiply
   8,655.48x = 12,978.59 × 4,485.14
4. Step 4: Simplify right side
   8,655.48x = 58,210,793.15
5. Step 5: Solve for x
   x = 58,210,793.15/8,655.48
6. Step 6: Final answer
   x = 6,725.31