Finding the Third Proportional to 4,891,650 and 10,128,900

Step by Step Solution

1. Step 1: Write the proportion equation
   4,891,650 : 10,128,900 = 10,128,900 : x
2. Step 2: Convert to fraction form
   4,891,650/10,128,900 = 10,128,900/x
3. Step 3: Cross multiply
   4,891,650x = 10,128,900 × 10,128,900
4. Step 4: Simplify right side
   4,891,650x = 102,594,615,210,000
5. Step 5: Solve for x
   x = 102,594,615,210,000/4,891,650
6. Step 6: Final answer
   x = 20,973,416.99