Finding the Third Proportional to 13,990 and 30,560

Step by Step Solution

1. Step 1: Write the proportion equation
   13,990 : 30,560 = 30,560 : x
2. Step 2: Convert to fraction form
   13,990/30,560 = 30,560/x
3. Step 3: Cross multiply
   13,990x = 30,560 × 30,560
4. Step 4: Simplify right side
   13,990x = 933,913,600
5. Step 5: Solve for x
   x = 933,913,600/13,990
6. Step 6: Final answer
   x = 66,755.80