Finding the Third Proportional to 28,870 and 45,128

Step by Step Solution

1. Step 1: Write the proportion equation
   28,870 : 45,128 = 45,128 : x
2. Step 2: Convert to fraction form
   28,870/45,128 = 45,128/x
3. Step 3: Cross multiply
   28,870x = 45,128 × 45,128
4. Step 4: Simplify right side
   28,870x = 2,036,536,384
5. Step 5: Solve for x
   x = 2,036,536,384/28,870
6. Step 6: Final answer
   x = 70,541.61