Finding the Third Proportional to 10,420 and 13,550

Step by Step Solution

1. Step 1: Write the proportion equation
   10,420 : 13,550 = 13,550 : x
2. Step 2: Convert to fraction form
   10,420/13,550 = 13,550/x
3. Step 3: Cross multiply
   10,420x = 13,550 × 13,550
4. Step 4: Simplify right side
   10,420x = 183,602,500
5. Step 5: Solve for x
   x = 183,602,500/10,420
6. Step 6: Final answer
   x = 17,620.20