Finding the Fourth Proportional to 8,659.63, 12,986.25 and 3,111.48

Step by Step Solution

1. Step 1: Write the proportion equation
   8,659.63 : 12,986.25 = 3,111.48 : x
2. Step 2: Convert to fraction form
   8,659.63/12,986.25 = 3,111.48/x
3. Step 3: Cross multiply
   8,659.63x = 12,986.25 × 3,111.48
4. Step 4: Simplify right side
   8,659.63x = 40,406,441.59
5. Step 5: Solve for x
   x = 40,406,441.59/8,659.63
6. Step 6: Final answer
   x = 4,666.07