Finding the Third Proportional to 743,680 and 1,117,216

Step by Step Solution

1. Step 1: Write the proportion equation
   743,680 : 1,117,216 = 1,117,216 : x
2. Step 2: Convert to fraction form
   743,680/1,117,216 = 1,117,216/x
3. Step 3: Cross multiply
   743,680x = 1,117,216 × 1,117,216
4. Step 4: Simplify right side
   743,680x = 1,248,171,590,656
5. Step 5: Solve for x
   x = 1,248,171,590,656/743,680
6. Step 6: Final answer
   x = 1,678,371.87