Finding the Third Proportional to 149,719.50 and 215,211

Step by Step Solution

1. Step 1: Write the proportion equation
   149,719.50 : 215,211 = 215,211 : x
2. Step 2: Convert to fraction form
   149,719.50/215,211 = 215,211/x
3. Step 3: Cross multiply
   149,719.50x = 215,211 × 215,211
4. Step 4: Simplify right side
   149,719.50x = 46,315,774,521
5. Step 5: Solve for x
   x = 46,315,774,521/149,719.50
6. Step 6: Final answer
   x = 309,350.32