Finding the Third Proportional to 3,390,436 and 5,120,216

Step by Step Solution

1. Step 1: Write the proportion equation
   3,390,436 : 5,120,216 = 5,120,216 : x
2. Step 2: Convert to fraction form
   3,390,436/5,120,216 = 5,120,216/x
3. Step 3: Cross multiply
   3,390,436x = 5,120,216 × 5,120,216
4. Step 4: Simplify right side
   3,390,436x = 26,216,611,886,656
5. Step 5: Solve for x
   x = 26,216,611,886,656/3,390,436
6. Step 6: Final answer
   x = 7,732,519.32