Finding the Third Proportional to 42,328 and 87,216

Step by Step Solution

1. Step 1: Write the proportion equation
   42,328 : 87,216 = 87,216 : x
2. Step 2: Convert to fraction form
   42,328/87,216 = 87,216/x
3. Step 3: Cross multiply
   42,328x = 87,216 × 87,216
4. Step 4: Simplify right side
   42,328x = 7,606,630,656
5. Step 5: Solve for x
   x = 7,606,630,656/42,328
6. Step 6: Final answer
   x = 179,706.83