Finding the Third Proportional to 248,580 and 388,858.50

Step by Step Solution

1. Step 1: Write the proportion equation
   248,580 : 388,858.50 = 388,858.50 : x
2. Step 2: Convert to fraction form
   248,580/388,858.50 = 388,858.50/x
3. Step 3: Cross multiply
   248,580x = 388,858.50 × 388,858.50
4. Step 4: Simplify right side
   248,580x = 151,210,933,022.25
5. Step 5: Solve for x
   x = 151,210,933,022.25/248,580
6. Step 6: Final answer
   x = 608,298.87