Finding the Third Proportional to 21,199.50 and 43,087.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,199.50 : 43,087.50 = 43,087.50 : x
2. Step 2: Convert to fraction form
   21,199.50/43,087.50 = 43,087.50/x
3. Step 3: Cross multiply
   21,199.50x = 43,087.50 × 43,087.50
4. Step 4: Simplify right side
   21,199.50x = 1,856,532,656.25
5. Step 5: Solve for x
   x = 1,856,532,656.25/21,199.50
6. Step 6: Final answer
   x = 87,574.36