Finding the Third Proportional to 216,123 and 347,249.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216,123 : 347,249.50 = 347,249.50 : x
2. Step 2: Convert to fraction form
   216,123/347,249.50 = 347,249.50/x
3. Step 3: Cross multiply
   216,123x = 347,249.50 × 347,249.50
4. Step 4: Simplify right side
   216,123x = 120,582,215,250.25
5. Step 5: Solve for x
   x = 120,582,215,250.25/216,123
6. Step 6: Final answer
   x = 557,933.28