Finding the Third Proportional to 283,905 and 427,042.50

Step by Step Solution

1. Step 1: Write the proportion equation
   283,905 : 427,042.50 = 427,042.50 : x
2. Step 2: Convert to fraction form
   283,905/427,042.50 = 427,042.50/x
3. Step 3: Cross multiply
   283,905x = 427,042.50 × 427,042.50
4. Step 4: Simplify right side
   283,905x = 182,365,296,806.25
5. Step 5: Solve for x
   x = 182,365,296,806.25/283,905
6. Step 6: Final answer
   x = 642,346.20