Finding the Third Proportional to 8,357.50 and 17,990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,357.50 : 17,990.50 = 17,990.50 : x
2. Step 2: Convert to fraction form
   8,357.50/17,990.50 = 17,990.50/x
3. Step 3: Cross multiply
   8,357.50x = 17,990.50 × 17,990.50
4. Step 4: Simplify right side
   8,357.50x = 323,658,090.25
5. Step 5: Solve for x
   x = 323,658,090.25/8,357.50
6. Step 6: Final answer
   x = 38,726.66