Finding the Fourth Proportional to 2,140.16, 2,954.82 and 1,915.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.16 : 2,954.82 = 1,915.72 : x
2. Step 2: Convert to fraction form
   2,140.16/2,954.82 = 1,915.72/x
3. Step 3: Cross multiply
   2,140.16x = 2,954.82 × 1,915.72
4. Step 4: Simplify right side
   2,140.16x = 5,660,600.38
5. Step 5: Solve for x
   x = 5,660,600.38/2,140.16
6. Step 6: Final answer
   x = 2,644.94