Finding the Third Proportional to 30,405 and 42,787

Step by Step Solution

1. Step 1: Write the proportion equation
   30,405 : 42,787 = 42,787 : x
2. Step 2: Convert to fraction form
   30,405/42,787 = 42,787/x
3. Step 3: Cross multiply
   30,405x = 42,787 × 42,787
4. Step 4: Simplify right side
   30,405x = 1,830,727,369
5. Step 5: Solve for x
   x = 1,830,727,369/30,405
6. Step 6: Final answer
   x = 60,211.39