Finding the Third Proportional to 9,120.09 and 19,646.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,120.09 : 19,646.30 = 19,646.30 : x
2. Step 2: Convert to fraction form
   9,120.09/19,646.30 = 19,646.30/x
3. Step 3: Cross multiply
   9,120.09x = 19,646.30 × 19,646.30
4. Step 4: Simplify right side
   9,120.09x = 385,976,980.90
5. Step 5: Solve for x
   x = 385,976,980.90/9,120.09
6. Step 6: Final answer
   x = 42,321.60