Finding the Third Proportional to 429,060 and 642,760

Step by Step Solution

1. Step 1: Write the proportion equation
   429,060 : 642,760 = 642,760 : x
2. Step 2: Convert to fraction form
   429,060/642,760 = 642,760/x
3. Step 3: Cross multiply
   429,060x = 642,760 × 642,760
4. Step 4: Simplify right side
   429,060x = 413,140,417,600
5. Step 5: Solve for x
   x = 413,140,417,600/429,060
6. Step 6: Final answer
   x = 962,896.61