Finding the Third Proportional to 104,128.50 and 215,638.50

Step by Step Solution

1. Step 1: Write the proportion equation
   104,128.50 : 215,638.50 = 215,638.50 : x
2. Step 2: Convert to fraction form
   104,128.50/215,638.50 = 215,638.50/x
3. Step 3: Cross multiply
   104,128.50x = 215,638.50 × 215,638.50
4. Step 4: Simplify right side
   104,128.50x = 46,499,962,682.25
5. Step 5: Solve for x
   x = 46,499,962,682.25/104,128.50
6. Step 6: Final answer
   x = 446,563.26