Finding the Third Proportional to 218,112 and 328,261.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,112 : 328,261.50 = 328,261.50 : x
2. Step 2: Convert to fraction form
   218,112/328,261.50 = 328,261.50/x
3. Step 3: Cross multiply
   218,112x = 328,261.50 × 328,261.50
4. Step 4: Simplify right side
   218,112x = 107,755,612,382.25
5. Step 5: Solve for x
   x = 107,755,612,382.25/218,112
6. Step 6: Final answer
   x = 494,037.98