Finding the Third Proportional to 42,128 and 63,902

Step by Step Solution

1. Step 1: Write the proportion equation
   42,128 : 63,902 = 63,902 : x
2. Step 2: Convert to fraction form
   42,128/63,902 = 63,902/x
3. Step 3: Cross multiply
   42,128x = 63,902 × 63,902
4. Step 4: Simplify right side
   42,128x = 4,083,465,604
5. Step 5: Solve for x
   x = 4,083,465,604/42,128
6. Step 6: Final answer
   x = 96,929.97