Finding the Third Proportional to 3,971.91 and 8,635.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,971.91 : 8,635.59 = 8,635.59 : x
2. Step 2: Convert to fraction form
   3,971.91/8,635.59 = 8,635.59/x
3. Step 3: Cross multiply
   3,971.91x = 8,635.59 × 8,635.59
4. Step 4: Simplify right side
   3,971.91x = 74,573,479.42
5. Step 5: Solve for x
   x = 74,573,479.42/3,971.91
6. Step 6: Final answer
   x = 18,775.24