Finding the Fourth Proportional to 2,706.88, 4,056.78 and 1,389.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,706.88 : 4,056.78 = 1,389.52 : x
2. Step 2: Convert to fraction form
   2,706.88/4,056.78 = 1,389.52/x
3. Step 3: Cross multiply
   2,706.88x = 4,056.78 × 1,389.52
4. Step 4: Simplify right side
   2,706.88x = 5,636,976.95
5. Step 5: Solve for x
   x = 5,636,976.95/2,706.88
6. Step 6: Final answer
   x = 2,082.46