Finding the Third Proportional to 448,642.50 and 689,592

Step by Step Solution

1. Step 1: Write the proportion equation
   448,642.50 : 689,592 = 689,592 : x
2. Step 2: Convert to fraction form
   448,642.50/689,592 = 689,592/x
3. Step 3: Cross multiply
   448,642.50x = 689,592 × 689,592
4. Step 4: Simplify right side
   448,642.50x = 475,537,126,464
5. Step 5: Solve for x
   x = 475,537,126,464/448,642.50
6. Step 6: Final answer
   x = 1,059,946.68