Finding the Third Proportional to 274,612 and 399,319.50

Step by Step Solution

1. Step 1: Write the proportion equation
   274,612 : 399,319.50 = 399,319.50 : x
2. Step 2: Convert to fraction form
   274,612/399,319.50 = 399,319.50/x
3. Step 3: Cross multiply
   274,612x = 399,319.50 × 399,319.50
4. Step 4: Simplify right side
   274,612x = 159,456,063,080.25
5. Step 5: Solve for x
   x = 159,456,063,080.25/274,612
6. Step 6: Final answer
   x = 580,659.49