Finding the Fourth Proportional to 2,706.60, 4,059.78 and 1,912.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,706.60 : 4,059.78 = 1,912.72 : x
2. Step 2: Convert to fraction form
   2,706.60/4,059.78 = 1,912.72/x
3. Step 3: Cross multiply
   2,706.60x = 4,059.78 × 1,912.72
4. Step 4: Simplify right side
   2,706.60x = 7,765,222.40
5. Step 5: Solve for x
   x = 7,765,222.40/2,706.60
6. Step 6: Final answer
   x = 2,869.00