Finding the Third Proportional to 316,969.50 and 687,696

Step by Step Solution

1. Step 1: Write the proportion equation
   316,969.50 : 687,696 = 687,696 : x
2. Step 2: Convert to fraction form
   316,969.50/687,696 = 687,696/x
3. Step 3: Cross multiply
   316,969.50x = 687,696 × 687,696
4. Step 4: Simplify right side
   316,969.50x = 472,925,788,416
5. Step 5: Solve for x
   x = 472,925,788,416/316,969.50
6. Step 6: Final answer
   x = 1,492,023.01