Finding the Third Proportional to 310,554 and 455,989.50

Step by Step Solution

1. Step 1: Write the proportion equation
   310,554 : 455,989.50 = 455,989.50 : x
2. Step 2: Convert to fraction form
   310,554/455,989.50 = 455,989.50/x
3. Step 3: Cross multiply
   310,554x = 455,989.50 × 455,989.50
4. Step 4: Simplify right side
   310,554x = 207,926,424,110.25
5. Step 5: Solve for x
   x = 207,926,424,110.25/310,554
6. Step 6: Final answer
   x = 669,533.88