Finding the Third Proportional to 434,142 and 679,009.50

Step by Step Solution

1. Step 1: Write the proportion equation
   434,142 : 679,009.50 = 679,009.50 : x
2. Step 2: Convert to fraction form
   434,142/679,009.50 = 679,009.50/x
3. Step 3: Cross multiply
   434,142x = 679,009.50 × 679,009.50
4. Step 4: Simplify right side
   434,142x = 461,053,901,090.25
5. Step 5: Solve for x
   x = 461,053,901,090.25/434,142
6. Step 6: Final answer
   x = 1,061,988.71