Finding the Third Proportional to 31,380 and 69,078

Step by Step Solution

1. Step 1: Write the proportion equation
   31,380 : 69,078 = 69,078 : x
2. Step 2: Convert to fraction form
   31,380/69,078 = 69,078/x
3. Step 3: Cross multiply
   31,380x = 69,078 × 69,078
4. Step 4: Simplify right side
   31,380x = 4,771,770,084
5. Step 5: Solve for x
   x = 4,771,770,084/31,380
6. Step 6: Final answer
   x = 152,064.06