Finding the Third Proportional to 367,218 and 665,239.50

Step by Step Solution

1. Step 1: Write the proportion equation
   367,218 : 665,239.50 = 665,239.50 : x
2. Step 2: Convert to fraction form
   367,218/665,239.50 = 665,239.50/x
3. Step 3: Cross multiply
   367,218x = 665,239.50 × 665,239.50
4. Step 4: Simplify right side
   367,218x = 442,543,592,360.25
5. Step 5: Solve for x
   x = 442,543,592,360.25/367,218
6. Step 6: Final answer
   x = 1,205,125.00