Finding the Fourth Proportional to 2,706.72, 4,058.16 and 1,387.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,706.72 : 4,058.16 = 1,387.88 : x
2. Step 2: Convert to fraction form
   2,706.72/4,058.16 = 1,387.88/x
3. Step 3: Cross multiply
   2,706.72x = 4,058.16 × 1,387.88
4. Step 4: Simplify right side
   2,706.72x = 5,632,239.10
5. Step 5: Solve for x
   x = 5,632,239.10/2,706.72
6. Step 6: Final answer
   x = 2,080.84