Finding the Third Proportional to 310,876 and 687,098.75

Step by Step Solution

1. Step 1: Write the proportion equation
   310,876 : 687,098.75 = 687,098.75 : x
2. Step 2: Convert to fraction form
   310,876/687,098.75 = 687,098.75/x
3. Step 3: Cross multiply
   310,876x = 687,098.75 × 687,098.75
4. Step 4: Simplify right side
   310,876x = 472,104,692,251.56
5. Step 5: Solve for x
   x = 472,104,692,251.56/310,876
6. Step 6: Final answer
   x = 1,518,627.02