Finding the Third Proportional to 5,215,903.88 and 7,978,748.06

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215,903.88 : 7,978,748.06 = 7,978,748.06 : x
2. Step 2: Convert to fraction form
   5,215,903.88/7,978,748.06 = 7,978,748.06/x
3. Step 3: Cross multiply
   5,215,903.88x = 7,978,748.06 × 7,978,748.06
4. Step 4: Simplify right side
   5,215,903.88x = 63,660,420,644,847.50
5. Step 5: Solve for x
   x = 63,660,420,644,847.50/5,215,903.88
6. Step 6: Final answer
   x = 12,205,060.17