Finding the Third Proportional to 138,550.50 and 298,290

Step by Step Solution

1. Step 1: Write the proportion equation
   138,550.50 : 298,290 = 298,290 : x
2. Step 2: Convert to fraction form
   138,550.50/298,290 = 298,290/x
3. Step 3: Cross multiply
   138,550.50x = 298,290 × 298,290
4. Step 4: Simplify right side
   138,550.50x = 88,976,924,100
5. Step 5: Solve for x
   x = 88,976,924,100/138,550.50
6. Step 6: Final answer
   x = 642,198.51