Finding the Third Proportional to 408,699 and 607,216.50

Step by Step Solution

1. Step 1: Write the proportion equation
   408,699 : 607,216.50 = 607,216.50 : x
2. Step 2: Convert to fraction form
   408,699/607,216.50 = 607,216.50/x
3. Step 3: Cross multiply
   408,699x = 607,216.50 × 607,216.50
4. Step 4: Simplify right side
   408,699x = 368,711,877,872.25
5. Step 5: Solve for x
   x = 368,711,877,872.25/408,699
6. Step 6: Final answer
   x = 902,159.97