Finding the Third Proportional to 30,215.25 and 64,804.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,215.25 : 64,804.50 = 64,804.50 : x
2. Step 2: Convert to fraction form
   30,215.25/64,804.50 = 64,804.50/x
3. Step 3: Cross multiply
   30,215.25x = 64,804.50 × 64,804.50
4. Step 4: Simplify right side
   30,215.25x = 4,199,623,220.25
5. Step 5: Solve for x
   x = 4,199,623,220.25/30,215.25
6. Step 6: Final answer
   x = 138,990.19