Finding the Third Proportional to 392,356.50 and 555,339

Step by Step Solution

1. Step 1: Write the proportion equation
   392,356.50 : 555,339 = 555,339 : x
2. Step 2: Convert to fraction form
   392,356.50/555,339 = 555,339/x
3. Step 3: Cross multiply
   392,356.50x = 555,339 × 555,339
4. Step 4: Simplify right side
   392,356.50x = 308,401,404,921
5. Step 5: Solve for x
   x = 308,401,404,921/392,356.50
6. Step 6: Final answer
   x = 786,023.44