Finding the Third Proportional to 4,428,500 and 9,210,438

Step by Step Solution

1. Step 1: Write the proportion equation
   4,428,500 : 9,210,438 = 9,210,438 : x
2. Step 2: Convert to fraction form
   4,428,500/9,210,438 = 9,210,438/x
3. Step 3: Cross multiply
   4,428,500x = 9,210,438 × 9,210,438
4. Step 4: Simplify right side
   4,428,500x = 84,832,168,151,844
5. Step 5: Solve for x
   x = 84,832,168,151,844/4,428,500
6. Step 6: Final answer
   x = 19,155,959.84