Finding the Third Proportional to 5,090,640 and 7,120,787

Step by Step Solution

1. Step 1: Write the proportion equation
   5,090,640 : 7,120,787 = 7,120,787 : x
2. Step 2: Convert to fraction form
   5,090,640/7,120,787 = 7,120,787/x
3. Step 3: Cross multiply
   5,090,640x = 7,120,787 × 7,120,787
4. Step 4: Simplify right side
   5,090,640x = 50,705,607,499,369
5. Step 5: Solve for x
   x = 50,705,607,499,369/5,090,640
6. Step 6: Final answer
   x = 9,960,556.53