Finding the Fourth Proportional to 2,777.88, 4,167.57 and 1,389.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,777.88 : 4,167.57 = 1,389.54 : x
2. Step 2: Convert to fraction form
   2,777.88/4,167.57 = 1,389.54/x
3. Step 3: Cross multiply
   2,777.88x = 4,167.57 × 1,389.54
4. Step 4: Simplify right side
   2,777.88x = 5,791,005.22
5. Step 5: Solve for x
   x = 5,791,005.22/2,777.88
6. Step 6: Final answer
   x = 2,084.69