Finding the Third Proportional to 80,640 and 112,790.25

Step by Step Solution

1. Step 1: Write the proportion equation
   80,640 : 112,790.25 = 112,790.25 : x
2. Step 2: Convert to fraction form
   80,640/112,790.25 = 112,790.25/x
3. Step 3: Cross multiply
   80,640x = 112,790.25 × 112,790.25
4. Step 4: Simplify right side
   80,640x = 12,721,640,495.06
5. Step 5: Solve for x
   x = 12,721,640,495.06/80,640
6. Step 6: Final answer
   x = 157,758.44