Finding the Third Proportional to 12,865,392 and 19,902,672

Step by Step Solution

1. Step 1: Write the proportion equation
   12,865,392 : 19,902,672 = 19,902,672 : x
2. Step 2: Convert to fraction form
   12,865,392/19,902,672 = 19,902,672/x
3. Step 3: Cross multiply
   12,865,392x = 19,902,672 × 19,902,672
4. Step 4: Simplify right side
   12,865,392x = 396,116,352,739,584
5. Step 5: Solve for x
   x = 396,116,352,739,584/12,865,392
6. Step 6: Final answer
   x = 30,789,295.25