Finding the Third Proportional to 12,782,056 and 17,978,815

Step by Step Solution

1. Step 1: Write the proportion equation
   12,782,056 : 17,978,815 = 17,978,815 : x
2. Step 2: Convert to fraction form
   12,782,056/17,978,815 = 17,978,815/x
3. Step 3: Cross multiply
   12,782,056x = 17,978,815 × 17,978,815
4. Step 4: Simplify right side
   12,782,056x = 323,237,788,804,225
5. Step 5: Solve for x
   x = 323,237,788,804,225/12,782,056
6. Step 6: Final answer
   x = 25,288,403.43