Finding the Third Proportional to 257,979 and 388,480.50

Step by Step Solution

1. Step 1: Write the proportion equation
   257,979 : 388,480.50 = 388,480.50 : x
2. Step 2: Convert to fraction form
   257,979/388,480.50 = 388,480.50/x
3. Step 3: Cross multiply
   257,979x = 388,480.50 × 388,480.50
4. Step 4: Simplify right side
   257,979x = 150,917,098,880.25
5. Step 5: Solve for x
   x = 150,917,098,880.25/257,979
6. Step 6: Final answer
   x = 584,997.61