Finding the Third Proportional to 1,915.76 and 3,216.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.76 : 3,216.43 = 3,216.43 : x
2. Step 2: Convert to fraction form
   1,915.76/3,216.43 = 3,216.43/x
3. Step 3: Cross multiply
   1,915.76x = 3,216.43 × 3,216.43
4. Step 4: Simplify right side
   1,915.76x = 10,345,407.37
5. Step 5: Solve for x
   x = 10,345,407.37/1,915.76
6. Step 6: Final answer
   x = 5,400.16