Finding the Third Proportional to 5,215,979 and 7,978,948.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215,979 : 7,978,948.50 = 7,978,948.50 : x
2. Step 2: Convert to fraction form
   5,215,979/7,978,948.50 = 7,978,948.50/x
3. Step 3: Cross multiply
   5,215,979x = 7,978,948.50 × 7,978,948.50
4. Step 4: Simplify right side
   5,215,979x = 63,663,619,165,652.25
5. Step 5: Solve for x
   x = 63,663,619,165,652.25/5,215,979
6. Step 6: Final answer
   x = 12,205,497.60