Finding the Third Proportional to 189,483 and 405,220.50

Step by Step Solution

1. Step 1: Write the proportion equation
   189,483 : 405,220.50 = 405,220.50 : x
2. Step 2: Convert to fraction form
   189,483/405,220.50 = 405,220.50/x
3. Step 3: Cross multiply
   189,483x = 405,220.50 × 405,220.50
4. Step 4: Simplify right side
   189,483x = 164,203,653,620.25
5. Step 5: Solve for x
   x = 164,203,653,620.25/189,483
6. Step 6: Final answer
   x = 866,587.79