Finding the Third Proportional to 61,216.50 and 129,786

Step by Step Solution

1. Step 1: Write the proportion equation
   61,216.50 : 129,786 = 129,786 : x
2. Step 2: Convert to fraction form
   61,216.50/129,786 = 129,786/x
3. Step 3: Cross multiply
   61,216.50x = 129,786 × 129,786
4. Step 4: Simplify right side
   61,216.50x = 16,844,405,796
5. Step 5: Solve for x
   x = 16,844,405,796/61,216.50
6. Step 6: Final answer
   x = 275,161.20