Finding the Third Proportional to 4,978,860 and 10,921,560

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978,860 : 10,921,560 = 10,921,560 : x
2. Step 2: Convert to fraction form
   4,978,860/10,921,560 = 10,921,560/x
3. Step 3: Cross multiply
   4,978,860x = 10,921,560 × 10,921,560
4. Step 4: Simplify right side
   4,978,860x = 119,280,472,833,600
5. Step 5: Solve for x
   x = 119,280,472,833,600/4,978,860
6. Step 6: Final answer
   x = 23,957,386.40