Finding the Third Proportional to 21,156 and 45,120

Step by Step Solution

1. Step 1: Write the proportion equation
   21,156 : 45,120 = 45,120 : x
2. Step 2: Convert to fraction form
   21,156/45,120 = 45,120/x
3. Step 3: Cross multiply
   21,156x = 45,120 × 45,120
4. Step 4: Simplify right side
   21,156x = 2,035,814,400
5. Step 5: Solve for x
   x = 2,035,814,400/21,156
6. Step 6: Final answer
   x = 96,228.70