Finding the Third Proportional to 42,381 and 90,390

Step by Step Solution

1. Step 1: Write the proportion equation
   42,381 : 90,390 = 90,390 : x
2. Step 2: Convert to fraction form
   42,381/90,390 = 90,390/x
3. Step 3: Cross multiply
   42,381x = 90,390 × 90,390
4. Step 4: Simplify right side
   42,381x = 8,170,352,100
5. Step 5: Solve for x
   x = 8,170,352,100/42,381
6. Step 6: Final answer
   x = 192,783.37