Finding the Third Proportional to 12,912,886 and 19,300,407

Step by Step Solution

1. Step 1: Write the proportion equation
   12,912,886 : 19,300,407 = 19,300,407 : x
2. Step 2: Convert to fraction form
   12,912,886/19,300,407 = 19,300,407/x
3. Step 3: Cross multiply
   12,912,886x = 19,300,407 × 19,300,407
4. Step 4: Simplify right side
   12,912,886x = 372,505,710,365,649
5. Step 5: Solve for x
   x = 372,505,710,365,649/12,912,886
6. Step 6: Final answer
   x = 28,847,595.37