Finding the Third Proportional to 138,606.75 and 298,530

Step by Step Solution

1. Step 1: Write the proportion equation
   138,606.75 : 298,530 = 298,530 : x
2. Step 2: Convert to fraction form
   138,606.75/298,530 = 298,530/x
3. Step 3: Cross multiply
   138,606.75x = 298,530 × 298,530
4. Step 4: Simplify right side
   138,606.75x = 89,120,160,900
5. Step 5: Solve for x
   x = 89,120,160,900/138,606.75
6. Step 6: Final answer
   x = 642,971.29