Finding the Third Proportional to 287,192 and 402,451.75

Step by Step Solution

1. Step 1: Write the proportion equation
   287,192 : 402,451.75 = 402,451.75 : x
2. Step 2: Convert to fraction form
   287,192/402,451.75 = 402,451.75/x
3. Step 3: Cross multiply
   287,192x = 402,451.75 × 402,451.75
4. Step 4: Simplify right side
   287,192x = 161,967,411,078.06
5. Step 5: Solve for x
   x = 161,967,411,078.06/287,192
6. Step 6: Final answer
   x = 563,969.09