Finding the Third Proportional to 148,905 and 318,586.50

Step by Step Solution

1. Step 1: Write the proportion equation
   148,905 : 318,586.50 = 318,586.50 : x
2. Step 2: Convert to fraction form
   148,905/318,586.50 = 318,586.50/x
3. Step 3: Cross multiply
   148,905x = 318,586.50 × 318,586.50
4. Step 4: Simplify right side
   148,905x = 101,497,357,982.25
5. Step 5: Solve for x
   x = 101,497,357,982.25/148,905
6. Step 6: Final answer
   x = 681,624.92