Finding the Third Proportional to 21,083.50 and 30,990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,083.50 : 30,990.50 = 30,990.50 : x
2. Step 2: Convert to fraction form
   21,083.50/30,990.50 = 30,990.50/x
3. Step 3: Cross multiply
   21,083.50x = 30,990.50 × 30,990.50
4. Step 4: Simplify right side
   21,083.50x = 960,411,090.25
5. Step 5: Solve for x
   x = 960,411,090.25/21,083.50
6. Step 6: Final answer
   x = 45,552.74