Finding the Third Proportional to 21,156 and 45,780

Step by Step Solution

1. Step 1: Write the proportion equation
   21,156 : 45,780 = 45,780 : x
2. Step 2: Convert to fraction form
   21,156/45,780 = 45,780/x
3. Step 3: Cross multiply
   21,156x = 45,780 × 45,780
4. Step 4: Simplify right side
   21,156x = 2,095,808,400
5. Step 5: Solve for x
   x = 2,095,808,400/21,156
6. Step 6: Final answer
   x = 99,064.49