Finding the Third Proportional to 155,956.50 and 328,210

Step by Step Solution

1. Step 1: Write the proportion equation
   155,956.50 : 328,210 = 328,210 : x
2. Step 2: Convert to fraction form
   155,956.50/328,210 = 328,210/x
3. Step 3: Cross multiply
   155,956.50x = 328,210 × 328,210
4. Step 4: Simplify right side
   155,956.50x = 107,721,804,100
5. Step 5: Solve for x
   x = 107,721,804,100/155,956.50
6. Step 6: Final answer
   x = 690,716.99