Finding the Third Proportional to 128,271.50 and 296,934

Step by Step Solution

1. Step 1: Write the proportion equation
   128,271.50 : 296,934 = 296,934 : x
2. Step 2: Convert to fraction form
   128,271.50/296,934 = 296,934/x
3. Step 3: Cross multiply
   128,271.50x = 296,934 × 296,934
4. Step 4: Simplify right side
   128,271.50x = 88,169,800,356
5. Step 5: Solve for x
   x = 88,169,800,356/128,271.50
6. Step 6: Final answer
   x = 687,368.59