Finding the Third Proportional to 216,711.75 and 287,551.69

Step by Step Solution

1. Step 1: Write the proportion equation
   216,711.75 : 287,551.69 = 287,551.69 : x
2. Step 2: Convert to fraction form
   216,711.75/287,551.69 = 287,551.69/x
3. Step 3: Cross multiply
   216,711.75x = 287,551.69 × 287,551.69
4. Step 4: Simplify right side
   216,711.75x = 82,685,972,984.10
5. Step 5: Solve for x
   x = 82,685,972,984.10/216,711.75
6. Step 6: Final answer
   x = 381,548.18