Finding the Third Proportional to 30,021.19 and 64,681.31

Step by Step Solution

1. Step 1: Write the proportion equation
   30,021.19 : 64,681.31 = 64,681.31 : x
2. Step 2: Convert to fraction form
   30,021.19/64,681.31 = 64,681.31/x
3. Step 3: Cross multiply
   30,021.19x = 64,681.31 × 64,681.31
4. Step 4: Simplify right side
   30,021.19x = 4,183,672,186.72
5. Step 5: Solve for x
   x = 4,183,672,186.72/30,021.19
6. Step 6: Final answer
   x = 139,357.32