Finding the Third Proportional to 34,200 and 51,300

Step by Step Solution

1. Step 1: Write the proportion equation
   34,200 : 51,300 = 51,300 : x
2. Step 2: Convert to fraction form
   34,200/51,300 = 51,300/x
3. Step 3: Cross multiply
   34,200x = 51,300 × 51,300
4. Step 4: Simplify right side
   34,200x = 2,631,690,000
5. Step 5: Solve for x
   x = 2,631,690,000/34,200
6. Step 6: Final answer
   x = 76,950