Finding the Third Proportional to 185,109 and 399,012

Step by Step Solution

1. Step 1: Write the proportion equation
   185,109 : 399,012 = 399,012 : x
2. Step 2: Convert to fraction form
   185,109/399,012 = 399,012/x
3. Step 3: Cross multiply
   185,109x = 399,012 × 399,012
4. Step 4: Simplify right side
   185,109x = 159,210,576,144
5. Step 5: Solve for x
   x = 159,210,576,144/185,109
6. Step 6: Final answer
   x = 860,090.95