Finding the Third Proportional to 190,508 and 287,490

Step by Step Solution

1. Step 1: Write the proportion equation
   190,508 : 287,490 = 287,490 : x
2. Step 2: Convert to fraction form
   190,508/287,490 = 287,490/x
3. Step 3: Cross multiply
   190,508x = 287,490 × 287,490
4. Step 4: Simplify right side
   190,508x = 82,650,500,100
5. Step 5: Solve for x
   x = 82,650,500,100/190,508
6. Step 6: Final answer
   x = 433,842.67