Finding the Third Proportional to 9,139.50 and 19,931.63

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.50 : 19,931.63 = 19,931.63 : x
2. Step 2: Convert to fraction form
   9,139.50/19,931.63 = 19,931.63/x
3. Step 3: Cross multiply
   9,139.50x = 19,931.63 × 19,931.63
4. Step 4: Simplify right side
   9,139.50x = 397,269,675.14
5. Step 5: Solve for x
   x = 397,269,675.14/9,139.50
6. Step 6: Final answer
   x = 43,467.33