Finding the Third Proportional to 392,877,936 and 855,507,510

Step by Step Solution

1. Step 1: Write the proportion equation
   392,877,936 : 855,507,510 = 855,507,510 : x
2. Step 2: Convert to fraction form
   392,877,936/855,507,510 = 855,507,510/x
3. Step 3: Cross multiply
   392,877,936x = 855,507,510 × 855,507,510
4. Step 4: Simplify right side
   392,877,936x = 731,893,099,666,400,128
5. Step 5: Solve for x
   x = 731,893,099,666,400,128/392,877,936
6. Step 6: Final answer
   x = 1,862,902,017.65