Finding the Third Proportional to 15,870 and 33,990

Step by Step Solution

1. Step 1: Write the proportion equation
   15,870 : 33,990 = 33,990 : x
2. Step 2: Convert to fraction form
   15,870/33,990 = 33,990/x
3. Step 3: Cross multiply
   15,870x = 33,990 × 33,990
4. Step 4: Simplify right side
   15,870x = 1,155,320,100
5. Step 5: Solve for x
   x = 1,155,320,100/15,870
6. Step 6: Final answer
   x = 72,799.00