Finding the Third Proportional to 12,937,865,989 and 19,874,146,386

Step by Step Solution

1. Step 1: Write the proportion equation
   12,937,865,989 : 19,874,146,386 = 19,874,146,386 : x
2. Step 2: Convert to fraction form
   12,937,865,989/19,874,146,386 = 19,874,146,386/x
3. Step 3: Cross multiply
   12,937,865,989x = 19,874,146,386 × 19,874,146,386
4. Step 4: Simplify right side
   12,937,865,989x = 394,981,694,572,156,878,848
5. Step 5: Solve for x
   x = 394,981,694,572,156,878,848/12,937,865,989
6. Step 6: Final answer
   x = 30,529,122,415.40