Finding the Third Proportional to 200,540 and 428,140

Step by Step Solution

1. Step 1: Write the proportion equation
   200,540 : 428,140 = 428,140 : x
2. Step 2: Convert to fraction form
   200,540/428,140 = 428,140/x
3. Step 3: Cross multiply
   200,540x = 428,140 × 428,140
4. Step 4: Simplify right side
   200,540x = 183,303,859,600
5. Step 5: Solve for x
   x = 183,303,859,600/200,540
6. Step 6: Final answer
   x = 914,051.36