Finding the Third Proportional to 42,129.75 and 89,454.75

Step by Step Solution

1. Step 1: Write the proportion equation
   42,129.75 : 89,454.75 = 89,454.75 : x
2. Step 2: Convert to fraction form
   42,129.75/89,454.75 = 89,454.75/x
3. Step 3: Cross multiply
   42,129.75x = 89,454.75 × 89,454.75
4. Step 4: Simplify right side
   42,129.75x = 8,002,152,297.56
5. Step 5: Solve for x
   x = 8,002,152,297.56/42,129.75
6. Step 6: Final answer
   x = 189,940.65