Finding the Third Proportional to 287,060 and 427,308

Step by Step Solution

1. Step 1: Write the proportion equation
   287,060 : 427,308 = 427,308 : x
2. Step 2: Convert to fraction form
   287,060/427,308 = 427,308/x
3. Step 3: Cross multiply
   287,060x = 427,308 × 427,308
4. Step 4: Simplify right side
   287,060x = 182,592,126,864
5. Step 5: Solve for x
   x = 182,592,126,864/287,060
6. Step 6: Final answer
   x = 636,076.52