Finding the Third Proportional to 8,584,915,253 and 12,958,991,538

Step by Step Solution

1. Step 1: Write the proportion equation
   8,584,915,253 : 12,958,991,538 = 12,958,991,538 : x
2. Step 2: Convert to fraction form
   8,584,915,253/12,958,991,538 = 12,958,991,538/x
3. Step 3: Cross multiply
   8,584,915,253x = 12,958,991,538 × 12,958,991,538
4. Step 4: Simplify right side
   8,584,915,253x = 167,935,461,681,955,602,432
5. Step 5: Solve for x
   x = 167,935,461,681,955,602,432/8,584,915,253
6. Step 6: Final answer
   x = 19,561,691,261.11