Finding the Third Proportional to 78,653.25 and 117,990

Step by Step Solution

1. Step 1: Write the proportion equation
   78,653.25 : 117,990 = 117,990 : x
2. Step 2: Convert to fraction form
   78,653.25/117,990 = 117,990/x
3. Step 3: Cross multiply
   78,653.25x = 117,990 × 117,990
4. Step 4: Simplify right side
   78,653.25x = 13,921,640,100
5. Step 5: Solve for x
   x = 13,921,640,100/78,653.25
6. Step 6: Final answer
   x = 177,000.19