Finding the Third Proportional to 412,846.50 and 638,056.50

Step by Step Solution

1. Step 1: Write the proportion equation
   412,846.50 : 638,056.50 = 638,056.50 : x
2. Step 2: Convert to fraction form
   412,846.50/638,056.50 = 638,056.50/x
3. Step 3: Cross multiply
   412,846.50x = 638,056.50 × 638,056.50
4. Step 4: Simplify right side
   412,846.50x = 407,116,097,192.25
5. Step 5: Solve for x
   x = 407,116,097,192.25/412,846.50
6. Step 6: Final answer
   x = 986,119.77