Finding the Third Proportional to 316,320 and 691,008

Step by Step Solution

1. Step 1: Write the proportion equation
   316,320 : 691,008 = 691,008 : x
2. Step 2: Convert to fraction form
   316,320/691,008 = 691,008/x
3. Step 3: Cross multiply
   316,320x = 691,008 × 691,008
4. Step 4: Simplify right side
   316,320x = 477,492,056,064
5. Step 5: Solve for x
   x = 477,492,056,064/316,320
6. Step 6: Final answer
   x = 1,509,522.18