Finding the Third Proportional to 18,311.06 and 39,421.69

Step by Step Solution

1. Step 1: Write the proportion equation
   18,311.06 : 39,421.69 = 39,421.69 : x
2. Step 2: Convert to fraction form
   18,311.06/39,421.69 = 39,421.69/x
3. Step 3: Cross multiply
   18,311.06x = 39,421.69 × 39,421.69
4. Step 4: Simplify right side
   18,311.06x = 1,554,069,445.35
5. Step 5: Solve for x
   x = 1,554,069,445.35/18,311.06
6. Step 6: Final answer
   x = 84,870.52