Finding the Third Proportional to 19,699.50 and 42,099

Step by Step Solution

1. Step 1: Write the proportion equation
   19,699.50 : 42,099 = 42,099 : x
2. Step 2: Convert to fraction form
   19,699.50/42,099 = 42,099/x
3. Step 3: Cross multiply
   19,699.50x = 42,099 × 42,099
4. Step 4: Simplify right side
   19,699.50x = 1,772,325,801
5. Step 5: Solve for x
   x = 1,772,325,801/19,699.50
6. Step 6: Final answer
   x = 89,968.06