Finding the Fourth Proportional to 2,061.64, 2,840.88 and 1,915.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,061.64 : 2,840.88 = 1,915.84 : x
2. Step 2: Convert to fraction form
   2,061.64/2,840.88 = 1,915.84/x
3. Step 3: Cross multiply
   2,061.64x = 2,840.88 × 1,915.84
4. Step 4: Simplify right side
   2,061.64x = 5,442,671.54
5. Step 5: Solve for x
   x = 5,442,671.54/2,061.64
6. Step 6: Final answer
   x = 2,639.97