Finding the Third Proportional to 111,520 and 245,216

Step by Step Solution

1. Step 1: Write the proportion equation
   111,520 : 245,216 = 245,216 : x
2. Step 2: Convert to fraction form
   111,520/245,216 = 245,216/x
3. Step 3: Cross multiply
   111,520x = 245,216 × 245,216
4. Step 4: Simplify right side
   111,520x = 60,130,886,656
5. Step 5: Solve for x
   x = 60,130,886,656/111,520
6. Step 6: Final answer
   x = 539,193.75