Finding the Third Proportional to 399,234 and 603,009.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,234 : 603,009.50 = 603,009.50 : x
2. Step 2: Convert to fraction form
   399,234/603,009.50 = 603,009.50/x
3. Step 3: Cross multiply
   399,234x = 603,009.50 × 603,009.50
4. Step 4: Simplify right side
   399,234x = 363,620,457,090.25
5. Step 5: Solve for x
   x = 363,620,457,090.25/399,234
6. Step 6: Final answer
   x = 910,795.32