Finding the Third Proportional to 215,466 and 288,045

Step by Step Solution

1. Step 1: Write the proportion equation
   215,466 : 288,045 = 288,045 : x
2. Step 2: Convert to fraction form
   215,466/288,045 = 288,045/x
3. Step 3: Cross multiply
   215,466x = 288,045 × 288,045
4. Step 4: Simplify right side
   215,466x = 82,969,922,025
5. Step 5: Solve for x
   x = 82,969,922,025/215,466
6. Step 6: Final answer
   x = 385,071.99