Finding the Third Proportional to 287,363 and 435,034

Step by Step Solution

1. Step 1: Write the proportion equation
   287,363 : 435,034 = 435,034 : x
2. Step 2: Convert to fraction form
   287,363/435,034 = 435,034/x
3. Step 3: Cross multiply
   287,363x = 435,034 × 435,034
4. Step 4: Simplify right side
   287,363x = 189,254,581,156
5. Step 5: Solve for x
   x = 189,254,581,156/287,363
6. Step 6: Final answer
   x = 658,590.64