Finding the Third Proportional to 9,970 and 21,158

Step by Step Solution

1. Step 1: Write the proportion equation
   9,970 : 21,158 = 21,158 : x
2. Step 2: Convert to fraction form
   9,970/21,158 = 21,158/x
3. Step 3: Cross multiply
   9,970x = 21,158 × 21,158
4. Step 4: Simplify right side
   9,970x = 447,660,964
5. Step 5: Solve for x
   x = 447,660,964/9,970
6. Step 6: Final answer
   x = 44,900.80