Finding the Third Proportional to 42,255.50 and 90,509

Step by Step Solution

1. Step 1: Write the proportion equation
   42,255.50 : 90,509 = 90,509 : x
2. Step 2: Convert to fraction form
   42,255.50/90,509 = 90,509/x
3. Step 3: Cross multiply
   42,255.50x = 90,509 × 90,509
4. Step 4: Simplify right side
   42,255.50x = 8,191,879,081
5. Step 5: Solve for x
   x = 8,191,879,081/42,255.50
6. Step 6: Final answer
   x = 193,865.39