Finding the Third Proportional to 18,997.50 and 28,390.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,997.50 : 28,390.50 = 28,390.50 : x
2. Step 2: Convert to fraction form
   18,997.50/28,390.50 = 28,390.50/x
3. Step 3: Cross multiply
   18,997.50x = 28,390.50 × 28,390.50
4. Step 4: Simplify right side
   18,997.50x = 806,020,490.25
5. Step 5: Solve for x
   x = 806,020,490.25/18,997.50
6. Step 6: Final answer
   x = 42,427.71