Finding the Third Proportional to 28,388 and 42,980

Step by Step Solution

1. Step 1: Write the proportion equation
   28,388 : 42,980 = 42,980 : x
2. Step 2: Convert to fraction form
   28,388/42,980 = 42,980/x
3. Step 3: Cross multiply
   28,388x = 42,980 × 42,980
4. Step 4: Simplify right side
   28,388x = 1,847,280,400
5. Step 5: Solve for x
   x = 1,847,280,400/28,388
6. Step 6: Final answer
   x = 65,072.58