Finding the Third Proportional to 9,139,391 and 19,707,031

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139,391 : 19,707,031 = 19,707,031 : x
2. Step 2: Convert to fraction form
   9,139,391/19,707,031 = 19,707,031/x
3. Step 3: Cross multiply
   9,139,391x = 19,707,031 × 19,707,031
4. Step 4: Simplify right side
   9,139,391x = 388,367,070,834,961
5. Step 5: Solve for x
   x = 388,367,070,834,961/9,139,391
6. Step 6: Final answer
   x = 42,493,758.15