Finding the Third Proportional to 5,149,659 and 7,978,180.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,149,659 : 7,978,180.50 = 7,978,180.50 : x
2. Step 2: Convert to fraction form
   5,149,659/7,978,180.50 = 7,978,180.50/x
3. Step 3: Cross multiply
   5,149,659x = 7,978,180.50 × 7,978,180.50
4. Step 4: Simplify right side
   5,149,659x = 63,651,364,090,580.25
5. Step 5: Solve for x
   x = 63,651,364,090,580.25/5,149,659
6. Step 6: Final answer
   x = 12,360,306.59