Finding the Fourth Proportional to 8,986.72, 13,471.56 and 3,139.52

Step by Step Solution

1. Step 1: Write the proportion equation
   8,986.72 : 13,471.56 = 3,139.52 : x
2. Step 2: Convert to fraction form
   8,986.72/13,471.56 = 3,139.52/x
3. Step 3: Cross multiply
   8,986.72x = 13,471.56 × 3,139.52
4. Step 4: Simplify right side
   8,986.72x = 42,294,232.05
5. Step 5: Solve for x
   x = 42,294,232.05/8,986.72
6. Step 6: Final answer
   x = 4,706.30