Finding the Third Proportional to 118,458 and 279,638.25

Step by Step Solution

1. Step 1: Write the proportion equation
   118,458 : 279,638.25 = 279,638.25 : x
2. Step 2: Convert to fraction form
   118,458/279,638.25 = 279,638.25/x
3. Step 3: Cross multiply
   118,458x = 279,638.25 × 279,638.25
4. Step 4: Simplify right side
   118,458x = 78,197,550,863.06
5. Step 5: Solve for x
   x = 78,197,550,863.06/118,458
6. Step 6: Final answer
   x = 660,128.91