Finding the Third Proportional to 86,443.50 and 128,412.75

Step by Step Solution

1. Step 1: Write the proportion equation
   86,443.50 : 128,412.75 = 128,412.75 : x
2. Step 2: Convert to fraction form
   86,443.50/128,412.75 = 128,412.75/x
3. Step 3: Cross multiply
   86,443.50x = 128,412.75 × 128,412.75
4. Step 4: Simplify right side
   86,443.50x = 16,489,834,362.56
5. Step 5: Solve for x
   x = 16,489,834,362.56/86,443.50
6. Step 6: Final answer
   x = 190,758.52