Finding the Third Proportional to 442,897.50 and 687,108

Step by Step Solution

1. Step 1: Write the proportion equation
   442,897.50 : 687,108 = 687,108 : x
2. Step 2: Convert to fraction form
   442,897.50/687,108 = 687,108/x
3. Step 3: Cross multiply
   442,897.50x = 687,108 × 687,108
4. Step 4: Simplify right side
   442,897.50x = 472,117,403,664
5. Step 5: Solve for x
   x = 472,117,403,664/442,897.50
6. Step 6: Final answer
   x = 1,065,974.42