Finding the Third Proportional to 5,215,598 and 7,978,414

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215,598 : 7,978,414 = 7,978,414 : x
2. Step 2: Convert to fraction form
   5,215,598/7,978,414 = 7,978,414/x
3. Step 3: Cross multiply
   5,215,598x = 7,978,414 × 7,978,414
4. Step 4: Simplify right side
   5,215,598x = 63,655,089,955,396
5. Step 5: Solve for x
   x = 63,655,089,955,396/5,215,598
6. Step 6: Final answer
   x = 12,204,753.89