Finding the Third Proportional to 9,135.56 and 19,681.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,135.56 : 19,681.31 = 19,681.31 : x
2. Step 2: Convert to fraction form
   9,135.56/19,681.31 = 19,681.31/x
3. Step 3: Cross multiply
   9,135.56x = 19,681.31 × 19,681.31
4. Step 4: Simplify right side
   9,135.56x = 387,354,061.72
5. Step 5: Solve for x
   x = 387,354,061.72/9,135.56
6. Step 6: Final answer
   x = 42,400.68