Finding the Third Proportional to 298,771.50 and 645,111

Step by Step Solution

1. Step 1: Write the proportion equation
   298,771.50 : 645,111 = 645,111 : x
2. Step 2: Convert to fraction form
   298,771.50/645,111 = 645,111/x
3. Step 3: Cross multiply
   298,771.50x = 645,111 × 645,111
4. Step 4: Simplify right side
   298,771.50x = 416,168,202,321
5. Step 5: Solve for x
   x = 416,168,202,321/298,771.50
6. Step 6: Final answer
   x = 1,392,931.40