Finding the Third Proportional to 222,920 and 487,312

Step by Step Solution

1. Step 1: Write the proportion equation
   222,920 : 487,312 = 487,312 : x
2. Step 2: Convert to fraction form
   222,920/487,312 = 487,312/x
3. Step 3: Cross multiply
   222,920x = 487,312 × 487,312
4. Step 4: Simplify right side
   222,920x = 237,472,985,344
5. Step 5: Solve for x
   x = 237,472,985,344/222,920
6. Step 6: Final answer
   x = 1,065,283.44