Finding the Third Proportional to 9,970,140 and 21,689,880

Step by Step Solution

1. Step 1: Write the proportion equation
   9,970,140 : 21,689,880 = 21,689,880 : x
2. Step 2: Convert to fraction form
   9,970,140/21,689,880 = 21,689,880/x
3. Step 3: Cross multiply
   9,970,140x = 21,689,880 × 21,689,880
4. Step 4: Simplify right side
   9,970,140x = 470,450,894,414,400
5. Step 5: Solve for x
   x = 470,450,894,414,400/9,970,140
6. Step 6: Final answer
   x = 47,185,986.80