Finding the Third Proportional to 66,215 and 144,808.50

Step by Step Solution

1. Step 1: Write the proportion equation
   66,215 : 144,808.50 = 144,808.50 : x
2. Step 2: Convert to fraction form
   66,215/144,808.50 = 144,808.50/x
3. Step 3: Cross multiply
   66,215x = 144,808.50 × 144,808.50
4. Step 4: Simplify right side
   66,215x = 20,969,501,672.25
5. Step 5: Solve for x
   x = 20,969,501,672.25/66,215
6. Step 6: Final answer
   x = 316,688.09