Finding the Third Proportional to 42,129 and 90,450

Step by Step Solution

1. Step 1: Write the proportion equation
   42,129 : 90,450 = 90,450 : x
2. Step 2: Convert to fraction form
   42,129/90,450 = 90,450/x
3. Step 3: Cross multiply
   42,129x = 90,450 × 90,450
4. Step 4: Simplify right side
   42,129x = 8,181,202,500
5. Step 5: Solve for x
   x = 8,181,202,500/42,129
6. Step 6: Final answer
   x = 194,194.08