Finding the Third Proportional to 21,156 and 45,799.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,156 : 45,799.50 = 45,799.50 : x
2. Step 2: Convert to fraction form
   21,156/45,799.50 = 45,799.50/x
3. Step 3: Cross multiply
   21,156x = 45,799.50 × 45,799.50
4. Step 4: Simplify right side
   21,156x = 2,097,594,200.25
5. Step 5: Solve for x
   x = 2,097,594,200.25/21,156
6. Step 6: Final answer
   x = 99,148.90