Finding the Third Proportional to 128,222 and 296,810

Step by Step Solution

1. Step 1: Write the proportion equation
   128,222 : 296,810 = 296,810 : x
2. Step 2: Convert to fraction form
   128,222/296,810 = 296,810/x
3. Step 3: Cross multiply
   128,222x = 296,810 × 296,810
4. Step 4: Simplify right side
   128,222x = 88,096,176,100
5. Step 5: Solve for x
   x = 88,096,176,100/128,222
6. Step 6: Final answer
   x = 687,059.76