Finding the Third Proportional to 18,642 and 28,140

Step by Step Solution

1. Step 1: Write the proportion equation
   18,642 : 28,140 = 28,140 : x
2. Step 2: Convert to fraction form
   18,642/28,140 = 28,140/x
3. Step 3: Cross multiply
   18,642x = 28,140 × 28,140
4. Step 4: Simplify right side
   18,642x = 791,859,600
5. Step 5: Solve for x
   x = 791,859,600/18,642
6. Step 6: Final answer
   x = 42,477.18