Finding the Third Proportional to 128,155.50 and 296,682

Step by Step Solution

1. Step 1: Write the proportion equation
   128,155.50 : 296,682 = 296,682 : x
2. Step 2: Convert to fraction form
   128,155.50/296,682 = 296,682/x
3. Step 3: Cross multiply
   128,155.50x = 296,682 × 296,682
4. Step 4: Simplify right side
   128,155.50x = 88,020,209,124
5. Step 5: Solve for x
   x = 88,020,209,124/128,155.50
6. Step 6: Final answer
   x = 686,823.50