Finding the Third Proportional to 4,221.56 and 8,947.69

Step by Step Solution

1. Step 1: Write the proportion equation
   4,221.56 : 8,947.69 = 8,947.69 : x
2. Step 2: Convert to fraction form
   4,221.56/8,947.69 = 8,947.69/x
3. Step 3: Cross multiply
   4,221.56x = 8,947.69 × 8,947.69
4. Step 4: Simplify right side
   4,221.56x = 80,061,111.60
5. Step 5: Solve for x
   x = 80,061,111.60/4,221.56
6. Step 6: Final answer
   x = 18,964.81