Finding the Third Proportional to 218,453 and 295,143.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,453 : 295,143.50 = 295,143.50 : x
2. Step 2: Convert to fraction form
   218,453/295,143.50 = 295,143.50/x
3. Step 3: Cross multiply
   218,453x = 295,143.50 × 295,143.50
4. Step 4: Simplify right side
   218,453x = 87,109,685,592.25
5. Step 5: Solve for x
   x = 87,109,685,592.25/218,453
6. Step 6: Final answer
   x = 398,757.10