Finding the Third Proportional to 76,860 and 168,300

Step by Step Solution

1. Step 1: Write the proportion equation
   76,860 : 168,300 = 168,300 : x
2. Step 2: Convert to fraction form
   76,860/168,300 = 168,300/x
3. Step 3: Cross multiply
   76,860x = 168,300 × 168,300
4. Step 4: Simplify right side
   76,860x = 28,324,890,000
5. Step 5: Solve for x
   x = 28,324,890,000/76,860
6. Step 6: Final answer
   x = 368,525.76