Finding the Third Proportional to 42,145.50 and 90,489

Step by Step Solution

1. Step 1: Write the proportion equation
   42,145.50 : 90,489 = 90,489 : x
2. Step 2: Convert to fraction form
   42,145.50/90,489 = 90,489/x
3. Step 3: Cross multiply
   42,145.50x = 90,489 × 90,489
4. Step 4: Simplify right side
   42,145.50x = 8,188,259,121
5. Step 5: Solve for x
   x = 8,188,259,121/42,145.50
6. Step 6: Final answer
   x = 194,285.49