Finding the Third Proportional to 248,059.50 and 538,128

Step by Step Solution

1. Step 1: Write the proportion equation
   248,059.50 : 538,128 = 538,128 : x
2. Step 2: Convert to fraction form
   248,059.50/538,128 = 538,128/x
3. Step 3: Cross multiply
   248,059.50x = 538,128 × 538,128
4. Step 4: Simplify right side
   248,059.50x = 289,581,744,384
5. Step 5: Solve for x
   x = 289,581,744,384/248,059.50
6. Step 6: Final answer
   x = 1,167,388.25