Finding the Third Proportional to 11,428,608 and 15,521,280

Step by Step Solution

1. Step 1: Write the proportion equation
   11,428,608 : 15,521,280 = 15,521,280 : x
2. Step 2: Convert to fraction form
   11,428,608/15,521,280 = 15,521,280/x
3. Step 3: Cross multiply
   11,428,608x = 15,521,280 × 15,521,280
4. Step 4: Simplify right side
   11,428,608x = 240,910,132,838,400
5. Step 5: Solve for x
   x = 240,910,132,838,400/11,428,608
6. Step 6: Final answer
   x = 21,079,569.17