Finding the Third Proportional to 118,557 and 279,859.50

Step by Step Solution

1. Step 1: Write the proportion equation
   118,557 : 279,859.50 = 279,859.50 : x
2. Step 2: Convert to fraction form
   118,557/279,859.50 = 279,859.50/x
3. Step 3: Cross multiply
   118,557x = 279,859.50 × 279,859.50
4. Step 4: Simplify right side
   118,557x = 78,321,339,740.25
5. Step 5: Solve for x
   x = 78,321,339,740.25/118,557
6. Step 6: Final answer
   x = 660,621.81