Finding the Third Proportional to 210,813 and 276,781.50

Step by Step Solution

1. Step 1: Write the proportion equation
   210,813 : 276,781.50 = 276,781.50 : x
2. Step 2: Convert to fraction form
   210,813/276,781.50 = 276,781.50/x
3. Step 3: Cross multiply
   210,813x = 276,781.50 × 276,781.50
4. Step 4: Simplify right side
   210,813x = 76,607,998,742.25
5. Step 5: Solve for x
   x = 76,607,998,742.25/210,813
6. Step 6: Final answer
   x = 363,393.14