Finding the Third Proportional to 42,810 and 56,820

Step by Step Solution

1. Step 1: Write the proportion equation
   42,810 : 56,820 = 56,820 : x
2. Step 2: Convert to fraction form
   42,810/56,820 = 56,820/x
3. Step 3: Cross multiply
   42,810x = 56,820 × 56,820
4. Step 4: Simplify right side
   42,810x = 3,228,512,400
5. Step 5: Solve for x
   x = 3,228,512,400/42,810
6. Step 6: Final answer
   x = 75,414.91