Finding the Third Proportional to 392,359 and 555,342

Step by Step Solution

1. Step 1: Write the proportion equation
   392,359 : 555,342 = 555,342 : x
2. Step 2: Convert to fraction form
   392,359/555,342 = 555,342/x
3. Step 3: Cross multiply
   392,359x = 555,342 × 555,342
4. Step 4: Simplify right side
   392,359x = 308,404,736,964
5. Step 5: Solve for x
   x = 308,404,736,964/392,359
6. Step 6: Final answer
   x = 786,026.92