Finding the Fourth Proportional to 1,915.72, 2,871.69 and 818.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.72 : 2,871.69 = 818.98 : x
2. Step 2: Convert to fraction form
   1,915.72/2,871.69 = 818.98/x
3. Step 3: Cross multiply
   1,915.72x = 2,871.69 × 818.98
4. Step 4: Simplify right side
   1,915.72x = 2,351,856.68
5. Step 5: Solve for x
   x = 2,351,856.68/1,915.72
6. Step 6: Final answer
   x = 1,227.66