Finding the Third Proportional to 3,970.69 and 8,557.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,970.69 : 8,557.31 = 8,557.31 : x
2. Step 2: Convert to fraction form
   3,970.69/8,557.31 = 8,557.31/x
3. Step 3: Cross multiply
   3,970.69x = 8,557.31 × 8,557.31
4. Step 4: Simplify right side
   3,970.69x = 73,227,597.22
5. Step 5: Solve for x
   x = 73,227,597.22/3,970.69
6. Step 6: Final answer
   x = 18,442.04