Finding the Third Proportional to 4,978,590 and 7,689,000

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978,590 : 7,689,000 = 7,689,000 : x
2. Step 2: Convert to fraction form
   4,978,590/7,689,000 = 7,689,000/x
3. Step 3: Cross multiply
   4,978,590x = 7,689,000 × 7,689,000
4. Step 4: Simplify right side
   4,978,590x = 59,120,721,000,000
5. Step 5: Solve for x
   x = 59,120,721,000,000/4,978,590
6. Step 6: Final answer
   x = 11,874,992.92