Finding the Third Proportional to 90,576 and 128,839.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,576 : 128,839.50 = 128,839.50 : x
2. Step 2: Convert to fraction form
   90,576/128,839.50 = 128,839.50/x
3. Step 3: Cross multiply
   90,576x = 128,839.50 × 128,839.50
4. Step 4: Simplify right side
   90,576x = 16,599,616,760.25
5. Step 5: Solve for x
   x = 16,599,616,760.25/90,576
6. Step 6: Final answer
   x = 183,267.28