Finding the Third Proportional to 42,310 and 90,999

Step by Step Solution

1. Step 1: Write the proportion equation
   42,310 : 90,999 = 90,999 : x
2. Step 2: Convert to fraction form
   42,310/90,999 = 90,999/x
3. Step 3: Cross multiply
   42,310x = 90,999 × 90,999
4. Step 4: Simplify right side
   42,310x = 8,280,818,001
5. Step 5: Solve for x
   x = 8,280,818,001/42,310
6. Step 6: Final answer
   x = 195,717.75