Finding the Third Proportional to 19,902 and 42,108

Step by Step Solution

1. Step 1: Write the proportion equation
   19,902 : 42,108 = 42,108 : x
2. Step 2: Convert to fraction form
   19,902/42,108 = 42,108/x
3. Step 3: Cross multiply
   19,902x = 42,108 × 42,108
4. Step 4: Simplify right side
   19,902x = 1,773,083,664
5. Step 5: Solve for x
   x = 1,773,083,664/19,902
6. Step 6: Final answer
   x = 89,090.73