Finding the Third Proportional to 190,818 and 280,391

Step by Step Solution

1. Step 1: Write the proportion equation
   190,818 : 280,391 = 280,391 : x
2. Step 2: Convert to fraction form
   190,818/280,391 = 280,391/x
3. Step 3: Cross multiply
   190,818x = 280,391 × 280,391
4. Step 4: Simplify right side
   190,818x = 78,619,112,881
5. Step 5: Solve for x
   x = 78,619,112,881/190,818
6. Step 6: Final answer
   x = 412,010.99