Finding the Third Proportional to 51,078 and 79,290

Step by Step Solution

1. Step 1: Write the proportion equation
   51,078 : 79,290 = 79,290 : x
2. Step 2: Convert to fraction form
   51,078/79,290 = 79,290/x
3. Step 3: Cross multiply
   51,078x = 79,290 × 79,290
4. Step 4: Simplify right side
   51,078x = 6,286,904,100
5. Step 5: Solve for x
   x = 6,286,904,100/51,078
6. Step 6: Final answer
   x = 123,084.38