Finding the Third Proportional to 12,739,725,657 and 19,109,590,429.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,739,725,657 : 19,109,590,429.50 = 19,109,590,429.50 : x
2. Step 2: Convert to fraction form
   12,739,725,657/19,109,590,429.50 = 19,109,590,429.50/x
3. Step 3: Cross multiply
   12,739,725,657x = 19,109,590,429.50 × 19,109,590,429.50
4. Step 4: Simplify right side
   12,739,725,657x = 365,176,446,383,238,021,120
5. Step 5: Solve for x
   x = 365,176,446,383,238,021,120/12,739,725,657
6. Step 6: Final answer
   x = 28,664,388,560.25