Finding the Third Proportional to 13,604 and 31,418

Step by Step Solution

1. Step 1: Write the proportion equation
   13,604 : 31,418 = 31,418 : x
2. Step 2: Convert to fraction form
   13,604/31,418 = 31,418/x
3. Step 3: Cross multiply
   13,604x = 31,418 × 31,418
4. Step 4: Simplify right side
   13,604x = 987,090,724
5. Step 5: Solve for x
   x = 987,090,724/13,604
6. Step 6: Final answer
   x = 72,558.86