Finding the Third Proportional to 5,215,899 and 7,978,750.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215,899 : 7,978,750.50 = 7,978,750.50 : x
2. Step 2: Convert to fraction form
   5,215,899/7,978,750.50 = 7,978,750.50/x
3. Step 3: Cross multiply
   5,215,899x = 7,978,750.50 × 7,978,750.50
4. Step 4: Simplify right side
   5,215,899x = 63,660,459,541,250.25
5. Step 5: Solve for x
   x = 63,660,459,541,250.25/5,215,899
6. Step 6: Final answer
   x = 12,205,079.04