Finding the Third Proportional to 445,025.50 and 688,657

Step by Step Solution

1. Step 1: Write the proportion equation
   445,025.50 : 688,657 = 688,657 : x
2. Step 2: Convert to fraction form
   445,025.50/688,657 = 688,657/x
3. Step 3: Cross multiply
   445,025.50x = 688,657 × 688,657
4. Step 4: Simplify right side
   445,025.50x = 474,248,463,649
5. Step 5: Solve for x
   x = 474,248,463,649/445,025.50
6. Step 6: Final answer
   x = 1,065,665.82