Finding the Third Proportional to 5,090,638 and 7,120,784

Step by Step Solution

1. Step 1: Write the proportion equation
   5,090,638 : 7,120,784 = 7,120,784 : x
2. Step 2: Convert to fraction form
   5,090,638/7,120,784 = 7,120,784/x
3. Step 3: Cross multiply
   5,090,638x = 7,120,784 × 7,120,784
4. Step 4: Simplify right side
   5,090,638x = 50,705,564,774,656
5. Step 5: Solve for x
   x = 50,705,564,774,656/5,090,638
6. Step 6: Final answer
   x = 9,960,552.05