Finding the Third Proportional to 393,885 and 611,059.50

Step by Step Solution

1. Step 1: Write the proportion equation
   393,885 : 611,059.50 = 611,059.50 : x
2. Step 2: Convert to fraction form
   393,885/611,059.50 = 611,059.50/x
3. Step 3: Cross multiply
   393,885x = 611,059.50 × 611,059.50
4. Step 4: Simplify right side
   393,885x = 373,393,712,540.25
5. Step 5: Solve for x
   x = 373,393,712,540.25/393,885
6. Step 6: Final answer
   x = 947,976.47