Finding the Third Proportional to 55,255.50 and 87,628.50

Step by Step Solution

1. Step 1: Write the proportion equation
   55,255.50 : 87,628.50 = 87,628.50 : x
2. Step 2: Convert to fraction form
   55,255.50/87,628.50 = 87,628.50/x
3. Step 3: Cross multiply
   55,255.50x = 87,628.50 × 87,628.50
4. Step 4: Simplify right side
   55,255.50x = 7,678,754,012.25
5. Step 5: Solve for x
   x = 7,678,754,012.25/55,255.50
6. Step 6: Final answer
   x = 138,968.14