Finding the Third Proportional to 218,322 and 328,291.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,322 : 328,291.50 = 328,291.50 : x
2. Step 2: Convert to fraction form
   218,322/328,291.50 = 328,291.50/x
3. Step 3: Cross multiply
   218,322x = 328,291.50 × 328,291.50
4. Step 4: Simplify right side
   218,322x = 107,775,308,972.25
5. Step 5: Solve for x
   x = 107,775,308,972.25/218,322
6. Step 6: Final answer
   x = 493,652.99