Finding the Third Proportional to 278,811 and 432,328.50

Step by Step Solution

1. Step 1: Write the proportion equation
   278,811 : 432,328.50 = 432,328.50 : x
2. Step 2: Convert to fraction form
   278,811/432,328.50 = 432,328.50/x
3. Step 3: Cross multiply
   278,811x = 432,328.50 × 432,328.50
4. Step 4: Simplify right side
   278,811x = 186,907,931,912.25
5. Step 5: Solve for x
   x = 186,907,931,912.25/278,811
6. Step 6: Final answer
   x = 670,375.03