Finding the Third Proportional to 53,115 and 81,529.50

Step by Step Solution

1. Step 1: Write the proportion equation
   53,115 : 81,529.50 = 81,529.50 : x
2. Step 2: Convert to fraction form
   53,115/81,529.50 = 81,529.50/x
3. Step 3: Cross multiply
   53,115x = 81,529.50 × 81,529.50
4. Step 4: Simplify right side
   53,115x = 6,647,059,370.25
5. Step 5: Solve for x
   x = 6,647,059,370.25/53,115
6. Step 6: Final answer
   x = 125,144.67