Finding the Third Proportional to 668,458.50 and 987,945

Step by Step Solution

1. Step 1: Write the proportion equation
   668,458.50 : 987,945 = 987,945 : x
2. Step 2: Convert to fraction form
   668,458.50/987,945 = 987,945/x
3. Step 3: Cross multiply
   668,458.50x = 987,945 × 987,945
4. Step 4: Simplify right side
   668,458.50x = 976,035,323,025
5. Step 5: Solve for x
   x = 976,035,323,025/668,458.50
6. Step 6: Final answer
   x = 1,460,128.52