Finding the Third Proportional to 129,588 and 211,606.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,588 : 211,606.50 = 211,606.50 : x
2. Step 2: Convert to fraction form
   129,588/211,606.50 = 211,606.50/x
3. Step 3: Cross multiply
   129,588x = 211,606.50 × 211,606.50
4. Step 4: Simplify right side
   129,588x = 44,777,310,842.25
5. Step 5: Solve for x
   x = 44,777,310,842.25/129,588
6. Step 6: Final answer
   x = 345,535.94