Finding the Third Proportional to 393,912 and 608,335.50

Step by Step Solution

1. Step 1: Write the proportion equation
   393,912 : 608,335.50 = 608,335.50 : x
2. Step 2: Convert to fraction form
   393,912/608,335.50 = 608,335.50/x
3. Step 3: Cross multiply
   393,912x = 608,335.50 × 608,335.50
4. Step 4: Simplify right side
   393,912x = 370,072,080,560.25
5. Step 5: Solve for x
   x = 370,072,080,560.25/393,912
6. Step 6: Final answer
   x = 939,479.07