Finding the Third Proportional to 372,939.50 and 816,406.50

Step by Step Solution

1. Step 1: Write the proportion equation
   372,939.50 : 816,406.50 = 816,406.50 : x
2. Step 2: Convert to fraction form
   372,939.50/816,406.50 = 816,406.50/x
3. Step 3: Cross multiply
   372,939.50x = 816,406.50 × 816,406.50
4. Step 4: Simplify right side
   372,939.50x = 666,519,573,242.25
5. Step 5: Solve for x
   x = 666,519,573,242.25/372,939.50
6. Step 6: Final answer
   x = 1,787,205.63