Finding the Third Proportional to 288,146 and 620,680

Step by Step Solution

1. Step 1: Write the proportion equation
   288,146 : 620,680 = 620,680 : x
2. Step 2: Convert to fraction form
   288,146/620,680 = 620,680/x
3. Step 3: Cross multiply
   288,146x = 620,680 × 620,680
4. Step 4: Simplify right side
   288,146x = 385,243,662,400
5. Step 5: Solve for x
   x = 385,243,662,400/288,146
6. Step 6: Final answer
   x = 1,336,973.83