Finding the Third Proportional to 171,321 and 272,821.50

Step by Step Solution

1. Step 1: Write the proportion equation
   171,321 : 272,821.50 = 272,821.50 : x
2. Step 2: Convert to fraction form
   171,321/272,821.50 = 272,821.50/x
3. Step 3: Cross multiply
   171,321x = 272,821.50 × 272,821.50
4. Step 4: Simplify right side
   171,321x = 74,431,570,862.25
5. Step 5: Solve for x
   x = 74,431,570,862.25/171,321
6. Step 6: Final answer
   x = 434,456.78