Finding the Third Proportional to 9,387 and 19,990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,387 : 19,990.50 = 19,990.50 : x
2. Step 2: Convert to fraction form
   9,387/19,990.50 = 19,990.50/x
3. Step 3: Cross multiply
   9,387x = 19,990.50 × 19,990.50
4. Step 4: Simplify right side
   9,387x = 399,620,090.25
5. Step 5: Solve for x
   x = 399,620,090.25/9,387
6. Step 6: Final answer
   x = 42,571.65