Finding the Third Proportional to 319,086 and 478,615.50

Step by Step Solution

1. Step 1: Write the proportion equation
   319,086 : 478,615.50 = 478,615.50 : x
2. Step 2: Convert to fraction form
   319,086/478,615.50 = 478,615.50/x
3. Step 3: Cross multiply
   319,086x = 478,615.50 × 478,615.50
4. Step 4: Simplify right side
   319,086x = 229,072,796,840.25
5. Step 5: Solve for x
   x = 229,072,796,840.25/319,086
6. Step 6: Final answer
   x = 717,903.00