Finding the Third Proportional to 490,230 and 668,335.50

Step by Step Solution

1. Step 1: Write the proportion equation
   490,230 : 668,335.50 = 668,335.50 : x
2. Step 2: Convert to fraction form
   490,230/668,335.50 = 668,335.50/x
3. Step 3: Cross multiply
   490,230x = 668,335.50 × 668,335.50
4. Step 4: Simplify right side
   490,230x = 446,672,340,560.25
5. Step 5: Solve for x
   x = 446,672,340,560.25/490,230
6. Step 6: Final answer
   x = 911,148.52