Finding the Third Proportional to 57,706.50 and 86,939.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,706.50 : 86,939.50 = 86,939.50 : x
2. Step 2: Convert to fraction form
   57,706.50/86,939.50 = 86,939.50/x
3. Step 3: Cross multiply
   57,706.50x = 86,939.50 × 86,939.50
4. Step 4: Simplify right side
   57,706.50x = 7,558,476,660.25
5. Step 5: Solve for x
   x = 7,558,476,660.25/57,706.50
6. Step 6: Final answer
   x = 130,981.37